Prep the zucchini

• Slice the zucchini into coins.
• Layer the zucchini coins in a baking dish.

Cook the beef and vegetables

• Saute the diced onion and sliced mushrooms in olive oil until softened.
• Add the ground beef and brown it.
• Stir in the minced garlic, marinara sauce and Italian seasoning, then season with salt and pepper.

Assemble the bake

• Combine the beef mixture with the zucchini coins in the baking dish.
• Top with mozzarella.

Bake

• Bake for 30 minutes.
• Top with more cheese and serve.