Preheat the oven to 425F.
Spray 2 muffin trays with spray oil (This recipe makes approx 16 pizza snacks, so you'll probably need two trays).
Place a tortilla on a chopping board and cut 4 circles out of it using an empty can or a cookie cutter (approx 2.5 inches diameter). Repeat with the remaining tortillas so you have 16 circles.
Press the tortilla circles into the muffin trays. Make sure you push them to the bottom and then squash the sides against the sides of the tray - so you have enough room for the toppings.
Place 1 tbsp of pizza sauce on each tortilla. Divide the cheddar between the tortillas.
Divide the pepperoni between half of the tortillas. Top the remaining tortillas with the mozzarella and red onion.
Place into oven and cook for 9-10 minutes.
Remove from the oven and leave to cool in the tin for 1 minute. Top the mozzarella pizzas with the basil. Sprinkle the parsley on the pepperoni pizzas before serving.
