Brown beef, onions and garlic in skillet over medium heat; drain off grease and add salt and pepper to taste.
Combine chili powder, cumin and paprika; stir into meat mixture.
Place 1 flour tortilla in the bottom of 2 pie plates; spread refried beans onto each tortilla; top each with 1/2 of the meat mixture and then place another tortilla on each. Place in preheated oven and bake for 10 minutes.
Remove from oven and top each pizza with 1/2 of the salsa. Garnish with green onions, olives and tomatoes; top each with 1/2 of the shredded cheese.
Return to oven for about 5 minutes or until cheese has melted; cool slightly.