Prepare the Garlic Butter: Melt the salted butter in a microwave-safe bowl. Add the minced garlic and Italian parsley (if using), then mix well.
Dip the Rolls: Dip each frozen dinner roll fully into the garlic butter to coat evenly.
Arrange in a Circular Pattern: Spray your pan with non-stick cooking spray. Place the rolls in two close circles to form a ring, ensuring they will rise upwards.
Let the Rolls Rise: Cover with a kitchen towel or plastic wrap, and let rise in a warm spot until doubled in size, about 2-3 hours (or 90 minutes in a hotter environment).
Add the Cheese: Preheat oven to 350°F. Sprinkle mozzarella cheese generously over the risen rolls and optionally add red pepper flakes for a spicy touch.
Bake Until Bubbly: Bake for 18-24 minutes, until rolls are golden and cheese melted and bubbly. Watch carefully to avoid over-browning.
Serve Warm: Serve the cheesy garlic monkey bread warm with marinara sauce on the side for dipping.