This Unstuffed Zucchini Casserole transforms the flavors of traditional stuffed zucchini into a simple meal that’s perfect for busy weeknights. From protein-packed ground beef to low-carb zucchini, everything gets layered together in a baking dish for an easy dinner that doesn’t skimp on flavor. A generous sprinkle of calcium-rich Cheddar melts into a golden topping that adds richness. It’s a comforting dinner that you’ll come back to again and again. Read on for our best tips and tricks below, including swaps to make and how to prevent the casserole from getting soggy.

Tips from the EatingWell Test Kitchen

These are the key tips we learned while developing and testing this recipe in our Test Kitchen to make sure it works, tastes great and is good for you too!

• Slice the zucchini evenly to ensure all the pieces cook at the same rate to achieve the perfect texture.
• Got summer squash? Use it! Summer squash and zucchini are interchangeable here.
• Medium zucchini work best for this recipe, as larger ones often have oversized seeds that can affect the texture.

Nutrition Notes

• Zucchini is a good source of vitamin C to help support a healthy immune system. This low-carb vegetable also contains carotenoids, including lutein and zeaxanthin, which may support bone strength, keep skin hydrated and lower risk of cardiovascular disease.
• Ground beef adds protein to this casserole, which can help you feel satiated. It also contains iron, which supports red blood cell health and energy levels. Choose a 93%-lean ground beef, which is leaner and contains less saturated fat. Eating an excess of saturated fat may lead to higher risk for heart disease.
• The tomatoes in the marinara sauce contain lycopene, an antioxidant that can reduce inflammation in the arteries, which can then lower the risk of heart disease. The tomato sauce also provides fiber to support gut health and digestion.