Prepare crust according to package directions. Press dough into a lightly greased 14-in. pizza pan; build up edges slightly. Bake at 400 degrees for 5-6 minutes or until crust is firm and begins to brown.
Put the tater tots in the oven and let them cook for about10 minutes until they start to brown....Spread sour cream over crust and sprinkle with garlic powder.
Mix tater tots when they are done cooking with the crumbled bacon, corn and onions. Layer it on the crust. Sprinkle with the cheeses.
Bake at 400 degrees for 25 minutes or until cheese is lightly browned and tater tots are cooked. Let stand for 5 minutes before cutting.