In a large bowl, mix flour, sugar, milk powder, yeast, and salt. Add olive oil and warm water, then mix until a dough forms.
Knead until the dough pulls together and looks smoother.
Cover and let rise until doubled in size.
Turn dough onto a lightly floured surface and knead briefly until smooth. Roll out evenly.
Cut dough into mini rounds with a cutter. Re-roll scraps and cut more.
Place rounds on a parchment-lined baking sheet and dock centers with a fork.
Top each round with pizza sauce, onion, bell pepper, pepperoni, olives, and mozzarella. Sprinkle oregano on top.
Bake at 400°F (205°C) until cheese melts and edges are golden. Cool 3–5 minutes before serving.