Cheesy "Baked" Spinach & Mozzarella Rigatoni

INGREDIENTS

large cloves Garlic

1 10 ounce package

Spinach, frozen

7 cups

Tomato sauce, good-quality

1 16 ounce package

Rigatoni

2 1/2 tsp

Kosher salt

1/8 tsp

Red pepper flakes

1/2 tsp

Sugar

2 tbsp

Olive oil

2 cups

Mozzarella cheese

1/2 cup

Parmesan cheese, grated

1 16 ounce container

Whole-milk cottage or ricotta cheese

ball Fresh mozzarella, chopped or pulled into bite-size pieces