Preheat the oven to 425 degrees. Coat a mini muffin tin with cooking spray.
Using a biscuit cutter, cut circles out of the tortillas while they are cold. Once you have all of the circles cut out, wrap them in a paper towel and microwave them for 30 seconds until they are pliable.
Press each tortilla circle into the mini muffin tray cups. Spoon some refried beans into each cup followed by the diced steak, shredded cheese, and olive slices.
Place into the oven and bake for 20 minutes. Remove from the oven and top each taco cup with a dollop of sour cream and green onions. Serve immediately. Enjoy.