Toast the English muffins in a toaster to prevent the middle from being soggy when you bake them. You can also bake them for a few minutes in the preheated oven.
Arrange the toasted English muffin halves cut-side up on a baking sheet line with aluminum foil for easy clean up.
Spread pizza sauce evenly on top of each one; sprinkle with mozzarella cheese and top with mini pepperoni slices.
Bake in the preheated oven at 375 degrees F for 10-12 minutes or until the cheese is melted and browned on the edges.