Spinach Parmesan Rice Bake

Name: Spinach Parmesan Rice Bake
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: American
Ingredients: 1 (10 ounce) package frozen chopped spinach (thawed and squeezed to remove excess liquid); 2 cups cooked white rice; 1/3 cup melted butter; 2 cups shredded cheddar cheese; 3/4 cup grated parmesan cheese; 1/3 cup chopped onions or 2 large green onions (chopped); 1 garlic clove (minced); 3 large eggs (beaten); 3/4 cup milk; salt and pepper to taste; 1/4 cup grated Parmesan cheese (for topping); shredded mozzarella cheese ((optional))