Preheat oven to 350F or 180 degrees celcious.
Grease 4 or 5 mini pizza trays with butter. (The number of trays will depend on the size)
Melt the butter, in a saucepan or microwave.
Add the sugar and vanilla and stir just until combined.
Add the flour, chocolate chips and a 1/4 cup M&Ms and egg, stir to combine.
Press the batter into the four of 5 mini pizza trays.
Add the remaining M&M's evenly to the top of the cookie dough.
Evenly add the chocolate Rolos pressing them into the batter as much as possible.
Bake for 15 - 20 minutes or until golden.
Allow the pizza cookie to cool in the tins for 5 minutes before slicing, The pizza cookies will firm up on cooling so it's best to slice them into pizza wedges whilst they are still warm.