1 pound ground beef 1 large egg, room temperature 1 tablespoon + ½ teaspoon fajita seasoning, divided Pinch of chili flakes ⅓ teaspoon onion powder ¾ teaspoon garlic powder, divided salt, to taste pepper, to taste ½ cup mayonnaise ¼ cup sour cream 1 tablespoon fresh coriander, finely chopped Juice of ½ lime 1 tablespoon cooking oil 1 large onion, sliced 2 red bell peppers, sliced 6 slices cheddar cheese 6 burger buns 1 cup lettuce leaves
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