01 - Cook the macaroni in salted boiling water according to package directions. Drain and set aside.
02 - In a medium saucepan, melt 1 tablespoon butter over medium heat. Whisk in the flour and cook for 1 minute.
03 - Gradually whisk in the milk, stirring constantly until the mixture thickens, about 2 minutes.
04 - Remove from heat and stir in the cheddar cheese until melted and smooth. Season with salt, pepper, and paprika.
05 - Add the drained macaroni to the cheese sauce and mix well. Let cool slightly.
06 - Lay out a tortilla on a flat surface. Spread 1/4 of the mac and cheese over half of the tortilla. Sprinkle with 2 tablespoons Monterey Jack cheese. Fold the tortilla in half to enclose the filling. Repeat with remaining tortillas.
07 - Heat a large skillet or griddle over medium heat. Melt a little butter and cook each quesadilla for 2–3 minutes per side, until golden brown and crispy, pressing gently with a spatula.
08 - Transfer to a cutting board, let cool for 1 minute, then cut into wedges and serve.