Easy Beef Tortilla Pizzas
["1 lb. ground beef", "1 medium onion, chopped", "1 tsp. dried oregano", "1 tsp. salt", "4 large flour tortillas (10-inch diameter)", "4 tsp. olive oil", "1 medium tomato, seeded and chopped", "Greek or Mexican Topping"]
["Cook and stir ground beef and onion in large skillet over medium high heat until beef loses pink color.", "Pour off drippings. Sprinkle oregano and salt over beef, stirring to combine.", "Place tortillas on 2 large baking sheets.", "Lightly brush surface of each tortilla with oil.", "Bake in preheated 400\u00b0 oven for 3 minutes. Divide beef mixture evenly over tops of tortillas.", "Divide tomato and desired topping over beef mixture.", "Bake at 400\u00b0 for 12 to 14 minutes."]
["ground beef", "onion", "oregano", "salt", "flour tortillas", "olive oil", "tomato", "Topping"]