Pre-heat oven to 325°.
To form each pizza, sandwich two tortillas together with a layer of refried beans, about 1 tablespoonful.
Add another layer of refried beans to the top of the tortillas, about a tablespoonful.
Cook ground beef, seasoning with salt and pepper, and drain well.
Add picante sauce and pinch of brown sugar to ground beef, mixing well and heating through.
Layer 2-3 spoonfuls of the ground beef mixture onto top of tortillas.
Shred cheese and add to top of ground beef mixture on pizzas.
Bake at 325° on ungreased cookie sheet for about 15 minutes or until heated all the way through and cheese is melted.
Meanwhile, wash and chop lettuce and tomatoes; wash, peel, and chop avocados. Set aside in serving bowls.
When fully cooked, remove pizzas from the oven and load your pizza down with all the yummy fixin's.
Serve with sour cream and enjoy.