Preheat the oven to 350°F.
Cut the biscuits into bite-sized pieces and place them in a large bowl.
Melt 1 stick of butter and pour it over the biscuit pieces, stirring to coat evenly.
Sprinkle the Italian seasoning and garlic salt over the biscuits and mix well. Add 1 ½ cups of mozzarella cheese and toss until the biscuits are coated.
Brush a bundt pan with melted butter. Sprinkle a thin layer of mozzarella cheese and half the Parmesan cheese into the bottom of the pan. Add a layer of pepperoni slices to fully cover the bottom.
Add half of the cheese-coated biscuit pieces to the bundt pan.
Sprinkle with more mozzarella cheese and add another layer of pepperoni slices.
Top with the remaining biscuit pieces. Pour the remaining ½ stick of melted butter evenly over the top. Finish with the rest of the mozzarella and Parmesan cheeses.
Bake for 20 minutes, or until the biscuits are golden brown.
Remove from the oven and let cool for at least 5 minutes.
Invert the bundt pan onto a serving plate, tapping gently to release the pizza monkey bread.
Add extra melted butter and cheese on top, if desired.
Serve warm, pull apart, and enjoy!