Preheat oven to 375°F (190°C) and spray two muffin tins with olive oil.
In a bowl, whisk together flour, baking powder, and salt.
Add Greek yogurt and mix until a crumbly dough forms.
Transfer dough to a floured surface and knead about 15 times until smooth and slightly tacky.
Divide into 16 equal balls.
Press each ball into muffin cups, slightly up the sides.
Bake for 15 minutes.
Remove from oven and gently press the center to create a well.
Add sauce, mozzarella, and turkey pepperoni to each.
Return to oven and bake for another 5–7 minutes until cheese is melted.
Serve Pepperoni Pizza Bites warm with optional red pepper flakes.