01 - Cook elbow macaroni in salted boiling water following package instructions until al dente. Drain thoroughly and set aside.
02 - In a medium saucepan over medium heat, melt 1 tablespoon butter. Whisk in flour and cook for 1 minute, stirring constantly to form a smooth paste.
03 - Gradually whisk in whole milk, stirring continuously until mixture thickens and bubbles, approximately 2 minutes. Remove from heat and stir in cheddar cheese until completely melted and smooth. Season with salt, pepper, and paprika.
04 - Add drained macaroni to the cheese sauce, mixing thoroughly to coat all pasta. Allow mixture to cool slightly for easier handling.
05 - Place one tortilla on a flat surface. Spread one-quarter of the mac and cheese mixture over half the tortilla. Sprinkle with 2 tablespoons Monterey Jack cheese. Fold tortilla in half to enclose filling. Repeat with remaining tortillas.
06 - Heat a large skillet or griddle over medium heat. Add a small portion of butter and melt. Place quesadilla in pan and cook for 2-3 minutes per side until golden brown and crispy, pressing gently with spatula. Transfer to cutting board and cool for 1 minute before cutting into wedges.