Step 1

Heat oil in skillet on medium heat. Add onions and cook 2-3 minutes until softened but not brown.

Step 2

Add ground beef. Break up the meat and cook, stirring regularly, until fully brown, about 4-5 minutes. (Drain any excess fat at this point, if applicable)

Step 3

Add Italian seasoning, salt and pepper and minced garlic. Stir and cook for one minute.

Step 4

Add diced tomatoes, tomato paste and water. Mix well to make a sauce. Bring to a boil, then lower the heat and simmer, uncovered, for 7-10 minutes.

Step 5

Add Parmesan cheese and zucchini and stir until well coated in sauce. Remove from heat.

Step 6

Transfer mixture to a 2- to 3- quart casserole dish. Top with shredded Italian cheese.

Step 7

Cover and bake in a 375F oven for 30 minutes. Remove cover and bake an additional 10 to 15 minutes uncovered. Remove from oven and allow to rest at least 10 minutes before serving.