Heat oil in a large skillet over medium-high heat. Season steak with salt and pepper to taste. Cook steak until browned, about 4 to 5 minutes on each side. Remove from skillet and transfer to a cutting board.

Reduce heat to medium-low. Add pasta sauce and pepper flakes. Stir to combine. Slice steak (against the grain) very thinly. Cut into bite sized pieces. Transfer steak back to skillet. Stir steak and sauce until steak is well coated. Add 1/4 cup mozzarella cheese. Cook until cheese is melted, stirring occasionally.

Preheat oven to 400 degrees F. Roll out pizza dough into a large rectangle. Be sure not to roll the dough too thin or it could break when you roll everything up.

Pour steak/sauce/cheese mixture over pizza dough. Use a spoon to spread steak and sauce over dough. Sprinkle remaining 1/2 cup mozzarella evenly over the steak and sauce.

Roll pizza dough up carefully lengthwise. Roll over edge and pinch edge to roll to secure. Trim ends of roll up. Cut roll up in half, and then cute each half into 6 pieces. Use a really sharp knife for this so it will cut through the steak - a serrated knife doesn't work as well.

Transfer roll ups to muffin tin cups. Bake for 15 to 18 minutes, or until dough is golden and sauce is bubbling.

Remove from oven. Let cool in cups for 5 to 10 minutes. Serve warm.