Lean Beef and Vegetable Bake
A hearty, all-in-one casserole loaded with lean ground beef, tender zucchini, bell peppers, and carrots in a light tomato sauce, topped with bubbly melted cheese. This cozy weeknight dinner comes together in one baking dish and fills the kitchen with the most comforting aroma.
For 4 servings
- prep
Preheat the oven and prep the vegetables.
Preheat the oven to 375°F. Slice the zucchini into half-moons, dice the bell pepper, finely dice the carrot, chop the onion, and mince the garlic.
TIPDice the carrots small so they become tender during baking. - prep
Make the crushed tomato sauce.
Drop the tomatoes into boiling water for 30 seconds, then transfer to cold water. Peel off the skins, crush the tomatoes by hand or with a fork into a rough puree, and set aside.
- saute · ~6 min
Brown the lean ground beef.
1.Heat olive oil in a large skillet over medium-high heat.2.Add the lean ground beef and cook, breaking it up with a wooden spoon, until browned and no longer pink (5-6 minutes).3.Season with a pinch of salt and black pepper, then transfer the beef to a plate using a slotted spoon, leaving any juices in the pan.TIPDon't overcrowd the pan — if needed, brown the beef in two batches for better color. - saute · ~8 min
Sauté the aromatics and vegetables.
1.In the same skillet, add the chopped onion and cook over medium heat until softened (3-4 minutes).2.Add the minced garlic and cook until fragrant (30 seconds).3.Stir in the diced carrots, bell pepper, and zucchini. Cook for 2-3 minutes, just until slightly softened. - mix · ~2 min
Combine the beef, tomato sauce, and seasonings.
1.Return the browned beef to the skillet with the vegetables.2.Add the crushed tomatoes, tomato paste, water, dried oregano, smoked paprika, and the remaining salt.3.Stir everything together until well combined and let it bubble gently for 2 minutes. - bake · ~20 min
Transfer to baking dish and bake.
Spoon the beef and vegetable mixture into a lightly greased 9x13 inch baking dish, spreading it evenly. Cover with foil and bake for 20 minutes.
TIPCovering with foil keeps the moisture in so the vegetables steam gently. - bake · ~10 min
Top with cheese and finish baking.
Remove the foil, sprinkle the shredded mozzarella evenly over the top, and bake uncovered for another 10 minutes until the cheese is melted and bubbly with golden spots.
- rest · ~5 min
Rest before serving.
Remove from the oven and let the bake rest for 5 minutes so the layers set. Sprinkle with fresh chopped parsley and serve.
TIPResting helps the casserole hold its shape when you scoop it out.
What to keep in mind.
5 tips from the recipe — small details that make a real difference to the final dish.
- 1Dice the carrots and bell pepper uniformly so they cook evenly with the beef.
- 2For deeper flavor, let the tomato paste caramelize for 30 seconds before adding liquid.
- 3If using lean beef (90/10 or 93/7), you don't need to drain fat — just leave the juices for flavor.
- 4To prevent soggy zucchini, don't overcook it during the sauté step; it will finish cooking in the oven.
- 5Let the bake rest for 5 minutes after baking to allow the juices to settle and the cheese to set.
Adapt it for your goals.
Low-carb/keto
Omit the carrots and replace with more zucchini or spinach to reduce carbs, and use full-fat mozzarella for a keto-friendly protein-packed casserole.
dairy freeDairy-free
Swap the mozzarella for a dairy-free shredded cheese alternative or a nutritional yeast topping to keep it creamy without dairy.
spicy southwestSpicy southwest
Add 1 diced jalapeño with the onions and a teaspoon of cumin to give the bake a smoky, spicy kick.
gluten freeGluten-free
This recipe is naturally gluten-free — just ensure your tomato paste and spices are certified gluten-free if needed.
extra vegExtra-veg
Fold in 1 cup of chopped mushrooms or spinach along with the other vegetables for more bulk and nutrients.
Why this is on our healthy list.
Rich in Lean Protein
Lean ground beef provides high-quality protein with less saturated fat, supporting muscle repair and satiety.
Packed with Vegetables
Zucchini, bell peppers, carrots, and onions deliver vitamins A and C, fiber, and antioxidants in every serving.
Controlled Sodium
With only 1/2 teaspoon of added salt, this dish relies on herbs and spices for flavor, making it a lower-sodium choice.
Calcium from Cheese
Part-skim mozzarella adds a moderate amount of calcium and protein while keeping the bake creamy and satisfying.
No Refined Grains
This casserole is naturally grain-free and low in refined carbohydrates, making it suitable for many balanced diets.
Frequently asked questions
Yes, ground turkey (93/7 lean) works well — just add a little extra olive oil to keep it moist since turkey is leaner.



