Cheesy Tortellini Casserole Recipe

Ingredients

• 1 1/2 pounds (24 ounces) prepared frozen cheese tortellini
• Salt
• 12 ounces cremini or white button mushrooms, roughly chopped or sliced into 1/4-inch slices
• 1 tablespoon butter
• 3 cloves garlic, minced (about 1 tablespoon)
• 1 28-ounce can crushed tomatoes
• 1 large bunch Swiss chard, ribs removed, leaves chopped (about 2 cups), OR 2 cups fresh chopped spinach, OR 1/2 cup frozen spinach
• 1 1/2 teaspoons dried basil or 1 tablespoon finely chopped fresh basil
• 1/4 teaspoon fennel seeds, crushed
• Pinch red pepper flakes
• 1/2 cup grated Parmesan cheese
• 4 to 6 ounces Mozzarella cheese slices, enough to cover the surface of the casserole