Steak Quesadillas

Ingredients

• 2 1/2 cups shredded monterey jack cheese
• 2 1/2 cups shredded mozzarella cheese
• 2 tablespoons olive oil
• guacamole
• 1/2 teaspoon ground cumin
• sour cream
• 1 medium onion
• 1 lb flank or skirt steak
• 1 teaspoon onion powder
• 1/2 teaspoon garlic powder
• 2 teaspoons kosher salt
• 1 teaspoon black pepper
• 10 medium flour tortillas