01 -
Bring a large pot of salted water to a boil. Cook the elbow macaroni according to package instructions until al dente. Drain thoroughly and set aside.
02 -
In a medium saucepan, melt 2 tablespoons of unsalted butter over medium heat. Sprinkle in the all-purpose flour and whisk constantly for 1 minute.
03 -
Gradually pour in the whole milk while whisking to form a smooth mixture. Continue cooking and stirring for 2 to 3 minutes, until the sauce thickens.
04 -
Reduce heat to low. Add shredded cheddar cheese, mozzarella cheese, mustard powder, garlic powder, salt, and black pepper. Stir until the sauce is fully melted and creamy.
05 -
Add the drained macaroni to the cheese sauce, stirring gently to coat all the pasta. Remove the saucepan from heat.
06 -
Lay out four tortillas. Evenly spread about 1/2 cup of the mac and cheese mixture onto each tortilla, leaving a 1/2-inch border. Top each with a second tortilla.
07 -
Heat a large skillet or griddle over medium heat. Melt a small amount of unsalted butter. Place one assembled quesadilla in the skillet and cook for 2 to 3 minutes per side, pressing gently, until both sides are golden brown and crisp. Repeat for remaining quesadillas, adding more butter as needed.
08 -
Remove cooked quesadillas from the skillet and let rest for 1 to 2 minutes before slicing into wedges. Serve immediately while hot.