Spread dough onto a lightly greased round pizza baking pan; bake at 425 degrees for 7 minutes. While baking, cube chicken; sauté with garlic in oil until juices run clear when pierced with a fork; season to taste with salt and pepper.
Spread Alfredo sauce over baked crust; sprinkle with chicken and onion. Bake 10 more minutes; top with cheese blend and return to oven until cheeses melt. Makes 8 servings.