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Prep Time: 15 minutes
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Cook Time: 30 minutes
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Total Time: 45 minutes
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Servings: 6 generous portions
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Cuisine: American / Comfort Food
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Dietary Focus: Keto, Low-Carb, Gluten-Free
Intensity & Cooking Metrics
Understanding heat intensities and cooking parameters ensures every element reaches its peak flavor and texture without burning or turning watery.
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Searing & Browning Intensity: Medium-High Heat ($\approx 375^\circ\text{F} / 190^\circ\text{C}$). Renders fat efficiently and creates a rich, golden flavor on the ground beef and aromatics.
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Sauteing Intensity: Medium Heat ($\approx 325^\circ\text{F} / 160^\circ\text{C}$). Softens bell peppers and cauliflower rice while allowing excess moisture to evaporate.
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Baking Intensity: High Oven Heat ($375^\circ\text{F} / 190^\circ\text{C}$). Melts the cheese uniformly and melds all flavors into a cohesive bake.
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Resting Metric: 5 to 7 minutes post-bake. Critical for allowing the juices to reabsorb and setting the cheese layers so slices hold together cleanly.
Ingredients Checklist
The Base & Proteins
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1.5 lbs (680g) Ground Beef (80/20 blend recommended for best flavor and fat ratio)
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3 large Bell Peppers (A mix of red, green, and yellow for color contrast), diced into 1/2-inch pieces
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3 cups Fresh Cauliflower Rice (Riced fresh or frozen; ensure frozen is well-drained)
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1 medium Yellow Onion, finely chopped
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3 cloves Garlic, minced
Sauce & Seasoning
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1 can (14.5 oz / 410g) Diced Tomatoes, well-drained (look for no sugar added)
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3 tbsp Tomato Paste (Unsweetened)
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1 tbsp Italian Seasoning (Dried oregano, basil, thyme, and rosemary blend)
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1 tsp Smoked Paprika
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1 tsp Ground Cumin
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1 tsp Sea Salt (adjust to taste)
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1/2 tsp Freshly Cracked Black Pepper
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1/2 tsp Red Pepper Flakes (Optional, for a slight heat boost)
Cheese & Fats
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1 tbsp Extra Virgin Olive Oil or Avocado Oil
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1.5 cups (150g) Shredded Mozzarella Cheese
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1 cup (100g) Sharp Cheddar Cheese, shredded
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1/4 cup Fresh Parsley, finely chopped for garnish
Step-by-Step Instructions
Step 1: Preheat & Prep the Dish
Preheat your oven to 375°F (190°C). Lightly grease a standard 9×13-inch (23×33 cm) ceramic or glass baking dish with olive oil or non-stick avocado oil spray. Set aside.
Step 2: Brown the Meat & Aromatics
Place a large skillet or Dutch oven over Medium-High Heat. Add the ground beef and chopped onion. Cook for 6 to 8 minutes, breaking up the meat with a wooden spoon until browned throughout.
Once cooked, drain excess grease if desired, leaving roughly 1 to 2 tablespoons in the skillet for moisture and flavor. Reduce heat to Medium, add the minced garlic, and stir for 60 seconds until fragrant.
Step 3: Cook the Peppers & Cauliflower Rice
Add the diced bell peppers, cauliflower rice, Italian seasoning, smoked paprika, cumin, salt, black pepper, and red pepper flakes to the skillet. Cook on Medium Heat for about 5 to 6 minutes.
Pro Tip: Keep the skillet uncovered during this step. Cooking off the excess moisture from the cauliflower rice and peppers prevents the casserole from becoming soggy while baking.
Step 4: Build the Sauce
Stir in the drained diced tomatoes and tomato paste, mixing thoroughly so the paste coats the beef and vegetable mixture evenly. Let the mixture simmer on Medium-Low Heat for 3 minutes until warm and combined. Remove from heat.
Step 5: Assemble the Casserole
Stir half of the shredded mozzarella and cheddar cheese directly into the warm beef and pepper mixture in the skillet. Transfer the entire contents into your prepared 9×13-inch baking dish, smoothing the top into an even layer with a spatula.
Top evenly with the remaining shredded mozzarella and cheddar cheese.
Step 6: Bake to Perfection
Place the baking dish on the center rack of your preheated oven at 375°F (190°C). Bake uncovered for 20 to 22 minutes, or until the cheese is completely melted, bubbly around the edges, and lightly golden.
Optional: For an extra crisp, brown crust, turn on the oven broiler for the final 2 minutes. Watch closely to prevent burning.
Step 7: Rest & Serve
Remove the casserole from the oven and let it rest for 5 to 7 minutes at room temperature. Sprinkle fresh chopped parsley over the top. Scoop generous portions into warm bowls or plates and enjoy!
Pro-Tips for Success & Storage
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Avoid Excess Water: Cauliflower rice releases moisture as it heats. Cooking it in the skillet before baking, alongside using well-drained diced tomatoes, guarantees a thick, rich consistency.
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Custom Protein Swaps: You can easily swap ground beef for ground turkey, ground chicken, or Italian pork sausage. If using lean meats like turkey, consider adding 1 tablespoon of olive oil to preserve richness.
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Meal Prep & Storage:
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Refrigeration: Store cooled leftover casserole in an airtight container in the fridge for up to 4 days.
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Reheating: Reheat individual portions in the microwave for 1.5 to 2 minutes or in a preheated 350°F oven for 10–12 minutes until warmed through.
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Freezing: Assemble the casserole (unbaked) without the top layer of cheese, cover tightly with foil, and freeze for up to 2 months. Thaw overnight in the fridge before baking as directed.
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Nutritional Information
Values are calculated per serving based on 6 equal portions.
| Metric | Amount Per Serving |
| Calories | 385 kcal |
| Total Fat | 25g |
| Saturated Fat | 11g |
| Trans Fat | 0.5g |
| Cholesterol | 85mg |
| Sodium | 680mg |
| Total Carbohydrates | 9g |
| Dietary Fiber | 3g |
| Net Carbohydrates | 6g |
| Protein | 30g |
| Vitamin C | 110% DV |
| Calcium | 25% DV |
| Iron | 18% DV |