Beat eggs with cottage cheese, dry mustard, chili powder and pepper. Stir in green onions, celery and red pepper; set aside. Spray 4 ramekins 1/2 cup (125 mL) with cooking spray. Place one tortilla in each ramekin, pressing to fit. Pour an equal amount of egg mixture into each tortilla cup. Bake in a 190°C (375°F) oven for 20 to 25 minutes or until eggs are set. Let stand for 5 minutes and serve.