Big Mac Quesadillas

Make special sauce: In a small bowl, use a spoon to stir together all sauce ingredients until well combined.

Cook beef: In a large nonstick pan over medium-high heat, heat oil. When oil is shimmering, add ground beef and season with salt and pepper. Cook, breaking up meat with a wooden spoon, until beef is cooked through and no longer pink, 6 minutes. Using a slotted spoon, transfer the ground beef to a plate. Drain excess fat from skillet and wipe clean with paper towels.

Make quesadillas: Place skillet over medium heat and grease with cooking spray. Add a flour tortilla, and top half of the tortilla with ½ slice American cheese, ¼ cup cheddar, and a generous spoonful of ground beef. Sprinkle with some onion. Drizzle with special sauce and top with another ½ slice American cheese. Fold the untopped half over the cheese and beef, and cook until deeply golden, about 1 minute. Flip quesadilla and cook 1 to 2 minutes more, until golden on the other side.

Repeat with remaining ingredients to make three more quesadillas.

Slice into triangles, and top with pickles.