Step 1: Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish or a bundt pan. Set aside.
Step 2: Separate the biscuit dough rounds. On a lightly floured surface, flatten each biscuit into a small, roughly 3-inch disc.
Step 3: Place a small amount of shredded mozzarella cheese (about 1 tablespoon) and a few mini pepperoni slices into the center of each flattened dough disc. Do not overfill.
Step 4: Carefully bring the edges of the dough together over the filling, pinching firmly to seal and form a ball. Ensure the seams are completely sealed to prevent cheese leakage during baking.
Step 5: Arrange the stuffed dough balls seam-side down in a single layer (or slightly stacked if using a bundt pan) in your prepared baking dish or bundt pan. They should be relatively snug.
Step 6: In a small bowl, whisk together the melted unsalted butter, minced garlic, Italian seasoning, and grated Parmesan cheese.
Step 7: Generously brush the garlic butter mixture over the tops of all the arranged dough balls in the pan.
Step 8: Bake for 20-25 minutes, or until the bites are puffed, golden brown, and the cheese inside is melted and bubbly.
Step 9: Remove from the oven and let cool slightly for a few minutes before serving. Serve warm with the warmed marinara or pizza sauce for dipping.