Cheeseburger Quesadilla
Ingredients:
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1 teaspoon butter
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½ small yellow onion, chopped
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2 pounds ground beef
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1 tablespoon Worcestershire sauce
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1 teaspoon salt
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1 teaspoon ground black pepper
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½ teaspoon garlic powder
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cooking spray
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8 (8 inch) flour tortillas
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2 cups shredded Colby cheese
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4 teaspoons ketchup, or to taste
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4 teaspoons yellow mustard, or to taste
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4 teaspoons sweet relish, or to taste