Preheat the oven to 400°F (207°C). Line a baking sheet with parchment paper.
If not already done, slice the French loaf into 1-inch (2.5 cm) thick slices and arrange the slices in a single layer on the prepared baking sheet.
In a small bowl, combine the melted salted butter, the finely minced (or pureed) garlic, and the chopped parsley; stir until evenly mixed.
Brush the garlic-butter mixture generously over the top of each bread slice.
Divide the 3/4 cup store-bought pizza sauce evenly among the slices and spread a thin layer of sauce on each slice.
Sprinkle the 8 oz (230 g) shredded mozzarella evenly over the sauced slices.
Top each slice with 3 to 4 mini pepperoni pieces, using the 40 pieces provided.
Bake in the preheated oven for 5 minutes, or until the cheese is melted. Remove from the oven and serve immediately.