1 pound pasta (spaghetti, penne, or your favorite)
2 tablespoons olive oil
2 cloves garlic, minced
1 (28 ounce) can crushed tomatoes
1 (10 ounce) package frozen spinach, thawed and squeezed dry
1/2 cup grated parmesan cheese
salt and pepper to taste
optional: red pepper flakes for heat