Begin by preparing the garlic butter mixture. In a mixing bowl, combine softened unsalted butter, grated parmesan cheese, garlic powder, and dried Italian seasoning. Use a fork or spatula to mix these ingredients until they form a smooth and creamy blend.
Next, take slices of white bread and spread the garlic butter mixture generously on one side of each slice.
With your skillet ready, place it over medium-low heat. Take one slice of bread and place it butter-side down in the skillet.
Layer the skillet with a generous portion of mozzarella cheese, followed by a layer of pepperoni. Repeat this layering with another slice of mozzarella and pepperoni, finishing off with a final layer of mozzarella cheese on top.
Carefully top your layered ingredients with another slice of bread, butter-side up. Press down gently to help the layers meld together.
Cover the skillet with a lid and let the sandwich cook for about 3-5 minutes.
After the first side is golden and crisp, flip your Pizza Grilled Cheese using a spatula, and place the lid back on the skillet.
Once both sides are beautifully golden and the cheese has reached that dreamy melted state, slide your Pizza Grilled Cheese from the skillet onto a cutting board, slice it in half, and serve hot with warm pizza sauce for dipping.