A protein-packed Mexican squash recipe filled with seasoned ground beef, homemade chile salsa, and melted cheese for a satisfying low-carb meal.
Recipe Card
High-Protein Calabacitas Rellenas de Carne Molida
Tender calabacitas boats filled with savory lean ground beef, topped with melted cheese, and simmered in a flavorful homemade tomato-chile salsa.
Prep Time: 20 minutes
Cook Time: 35 minutes
Total Time: 55 minutes
Yield: 4 large servings
Dietary Information:
- High-Protein
- Low-Carb Friendly
- Gluten-Free
- Keto-Friendly
- Meal Prep Friendly
Ingredients
- 4 medium calabacitas (Mexican squash) or zucchini
- 1½ lb (680 g) lean ground beef (90% lean or higher)
- ½ medium onion, finely chopped
- 2 garlic cloves, finely chopped
- ½ bell pepper, diced
- Salt, to taste
- Black pepper, to taste
- Garlic powder, to taste
- Onion powder, to taste
- 4 Roma tomatoes
- 1 dried guajillo chile
- 1 dried árbol chile
- 1½ cups shredded low-fat mozzarella or Monterey Jack cheese
Instructions
- Slice the calabacitas lengthwise and carefully scoop out the centers, leaving about a ½-inch border. Reserve the squash pulp for the salsa.
- Bring a pot of salted water to a boil and cook the squash halves for exactly 5 minutes. Remove and set aside.
- Heat a large skillet over medium heat. Brown the lean ground beef until fully cooked.
- Add onion, garlic, and bell pepper. Cook until the vegetables soften.
- Season the beef mixture with salt, pepper, garlic powder, and onion powder. Drain excess fat if needed.
- Boil Roma tomatoes and dried chiles until softened.
- Blend tomatoes, chiles, reserved squash pulp, ½ cup water, and salt until smooth.
- Simmer the salsa for 5 minutes to deepen the flavor.
- Place squash boats into the salsa and fill each one generously with the beef mixture.
- Top with shredded cheese, cover, and simmer for about 5 minutes until the cheese melts.
- Serve warm and enjoy.
Additional Notes
- Choose firm calabacitas with smooth, unblemished skin for the best texture.
- Do not overcook the squash during boiling because it needs enough structure to hold the filling.
- For extra flavor, allow the salsa to simmer a few extra minutes before assembling.
- The recipe is naturally gluten-free and works well for high-protein meal planning.
About This High-Protein Calabacitas Rellenas Recipe
Calabacitas rellenas are a classic Mexican-inspired comfort food that transforms simple squash into a complete meal. This high-protein version keeps everything people love about the traditional dish—the tender squash, flavorful tomato-chile sauce, seasoned beef, and melted cheese—while increasing the protein content for a more filling option.
This recipe was designed for anyone who wants a satisfying meal that supports higher protein goals without sacrificing flavor. Instead of relying on heavy ingredients, it uses lean ground beef, vegetables, and a bold homemade salsa to create a balanced dish.
The best part? These stuffed squash boats look impressive but are surprisingly simple to prepare. They are perfect for family dinners, meal prep, or anyone looking for a lighter alternative to traditional casseroles.
How to Make High-Protein Calabacitas Rellenas
Prepare the Calabacitas Boats
Start by washing the calabacitas and slicing each one lengthwise. Using a spoon, carefully scoop out the center of each squash half.
The goal is to create a sturdy squash shell that can hold the beef filling. Leave around a ½-inch border so the squash keeps its shape while cooking.
Reserve the scooped-out squash pulp. It adds moisture and flavor to the homemade salsa instead of going to waste.
Tip: Avoid scooping too deeply. A thin squash wall can break apart during simmering.
Lightly Cook the Squash
Bring a large pot of salted water to a boil. Carefully place the squash halves into the water and cook for exactly 5 minutes.
This quick cooking step softens the squash slightly while keeping enough firmness for stuffing.
Remove the squash and allow it to cool while preparing the filling.
Tip: If your squash feels very soft after boiling, reduce the cooking time by a minute next time. The final simmer will continue cooking the vegetables.
Make the High-Protein Beef Filling
Heat a large skillet over medium heat and add the lean ground beef.
Cook until the beef is browned and completely cooked through. Breaking the meat into smaller pieces helps create an even filling texture.
Add the chopped onion, garlic, and bell pepper. Cook until the vegetables become tender and fragrant.
Season generously with salt, pepper, garlic powder, and onion powder. These simple seasonings create the savory flavor that makes the filling so satisfying.
Drain excess fat if needed, especially if using a beef blend with a higher fat percentage.
Tip: Using 90% lean ground beef keeps the recipe high in protein while still providing enough flavor and moisture.
Prepare the Homemade Chile Salsa
The salsa is what brings the entire dish together.
Boil the Roma tomatoes and dried guajillo and árbol chiles until softened. Guajillo chiles provide a mild, slightly fruity flavor, while árbol chiles add a small amount of heat.
Blend the softened tomatoes and chiles with the reserved squash pulp, water, and salt until smooth.
Simmer the salsa for about 5 minutes. This allows the flavors to combine and creates a richer sauce.
Tip: Remove the seeds from the árbol chile if you prefer a milder salsa.
Assemble and Finish
Place the prepared squash boats into the salsa. Spoon the seasoned beef mixture generously into each squash half.
Add a generous layer of shredded low-fat mozzarella or Monterey Jack cheese on top.
Cover the pan and simmer until the cheese melts completely.
The result is tender squash filled with a protein-rich beef mixture and surrounded by flavorful homemade salsa.
Ingredient Details and Substitution Tips
Calabacitas or Zucchini
Calabacitas are Mexican squash varieties similar to zucchini. They have a mild flavor and tender texture that works perfectly for stuffing.
If you cannot find calabacitas, regular zucchini is an excellent substitute.
Selection tip: Choose medium-sized squash because very large zucchini can have more seeds and a softer texture.
Lean Ground Beef
Lean ground beef is the main protein source in this recipe. Using 90% lean beef or higher keeps the dish lighter while maintaining the classic savory flavor.
Substitutions:
- Ground turkey can replace beef for a leaner option.
- Ground chicken works well but may need extra seasoning.
- Ground bison can provide a similar rich flavor.
Cheese
Low-fat mozzarella or Monterey Jack creates the creamy melted topping while keeping the recipe aligned with higher-protein goals.
Substitutions:
- Reduced-fat Mexican cheese blend
- Part-skim mozzarella
- Pepper Jack for extra spice
Dried Chiles
The combination of guajillo and árbol chiles creates a balanced salsa.
- Guajillo chile: mild, slightly sweet flavor
- Árbol chile: brighter heat
Substitutions:
- Mild chili powder can replace guajillo flavor.
- Ancho chile can be used for a deeper smoky taste.
Recipe Variations and Serving Suggestions
Extra Spicy Calabacitas Rellenas
Add one additional árbol chile to the salsa for more heat.
Mexican Taco Style
Mix 1 teaspoon cumin and 1 teaspoon smoked paprika into the beef filling for a taco-inspired flavor.
More Vegetable Version
Add diced mushrooms, spinach, or chopped zucchini to the beef mixture for additional vegetables.
Dairy-Free Option
Replace cheese with a dairy-free shredded cheese alternative.
Vegetarian Version
Replace ground beef with:
- Lentils
- Black beans
- Plant-based ground meat alternatives
The texture will change, but the squash and salsa flavors remain delicious.
Serving Ideas
Serve these stuffed squash boats with:
- Fresh avocado slices
- A side salad
- Cauliflower rice
- Fresh cilantro
- Lime wedges
For meal prep, portion one or two squash boats per container for an easy high-protein lunch.
Storage and Make-Ahead Instructions
Storage
Store leftover high-protein calabacitas rellenas in an airtight container in the refrigerator for up to 4 days.
Keep the squash, filling, and salsa together because the flavors continue to develop as they sit.
Reheating
Reheat in the microwave for 1–2 minutes until warmed through, or place in a covered baking dish at 350°F for about 15 minutes.
Adding a small spoonful of extra salsa before reheating helps prevent the squash from drying out.
Make-Ahead Tips
You can prepare several parts of this recipe ahead:
- Cook the beef filling up to 2 days in advance.
- Prepare the salsa and refrigerate it separately.
- Assemble the squash boats before cooking and store covered in the refrigerator.
For the best texture, cook the squash fresh when possible.
Shelf Life Notes
The squash will soften slightly after a few days because it absorbs moisture from the salsa. The flavor remains excellent, but the texture is best within the first 2–3 days.
Nutrition Facts
Approximate nutrition per serving (recipe makes 4 servings):
| Nutrient | Amount |
|---|---|
| Calories | 600 kcal |
| Protein | 50 g |
| Carbohydrates | 18 g |
| Fiber | 5 g |
| Net Carbs | 13 g |
| Fat | 38 g |
| Saturated Fat | 15 g |
| Sodium | 850 mg |
Dietary Highlights:
- High-protein meal with approximately 50 grams of protein per serving
- Low-carb friendly
- Gluten-free
- Rich in vegetables and protein
Allergens: Contains dairy (cheese).
Frequently Asked Questions
Can I use zucchini instead of calabacitas?
Yes. Zucchini is one of the easiest substitutions because it has a similar size, texture, and mild flavor.
Can I freeze high-protein calabacitas rellenas?
Yes, but the squash texture may become softer after freezing. Store portions in freezer-safe containers for up to 2 months.
Thaw overnight in the refrigerator before reheating.
How can I increase the protein even more?
You can slightly increase the ground beef amount, use extra-lean beef, or add more cheese while keeping the dish balanced.
Can I make this recipe less spicy?
Yes. Reduce or remove the árbol chile and use only guajillo chile for a milder salsa.
Why did my squash become too soft?
The squash may have been boiled too long. Five minutes is enough because it continues cooking while simmering with the salsa.
Final Thoughts
This high-protein calabacitas rellenas recipe proves that healthy eating does not have to mean boring meals. Every bite delivers seasoned beef, tender squash, flavorful salsa, and melted cheese in a balanced dish that feels comforting and satisfying.
Whether you are preparing weekly meals, following a higher-protein lifestyle, or simply looking for a delicious Mexican-inspired dinner, these stuffed squash boats are a recipe worth adding to your rotation.
If you try this recipe, share your favorite variations and let others know how you customized your calabacitas rellenas.
