Preheat oven to 350°F. Heat oil in large skillet on medium-high heat. Add beef; cook and stir until browned. Drain fat, if needed. Return beef to skillet. Add onion, seasoned salt and garlic powder; cook and stir 5 minutes. Add cheese; cook and stir until melted.
Place 3 tortillas on ungreased baking sheet. Spread 1/3 of the meat mixture evenly on each tortilla. Top with remaining tortillas. Lightly brush with oil. Sprinkle with additional seasoned salt, if desired.
Bake 5 minutes or until heated through. Cut into 3-inch wedges. Serve warm.