Bring a large pot of water to a boil and cook the macaroni noodles until al dente or as directed on the packaging. Drain once cooked.
225 grams Elbow Macaroni
Melt, in a large skillet on medium heat, the butter. Whisk in the flour until smooth. Let simmer for 30 seconds until lightly golden with a nutty aroma. This is called a "roux" and what will thicken the cheese sauce.
2 tablespoon Butter, 2 tablespoon All Purpose Flour
Slowly pour the milk into the roux, a little at a time while whisking, letting it return to a smooth consistency after each addition. ** IF you are making this recipe only for the Macaroni and Cheese, I recommend adding another ½ cup of milk at this point for a creamier result. **
1½ cup Milk
Bring the sauce back to a simmer and whisk in the grated cheese. Add the salt and dry oregano. Once the sauce is smooth, turn off the heat.
Add the cooked macaroni into the cheese sauce. Stir until fully incorporated. Let the mac n cheese rest for 5-10 minutes to lightly thicken.
Assemble the Grilled Cheese
Use a griddle or large frying pan to cook the grilled cheeses. Butter the outside of the bread slices and place butter side down on the grill. Place a slice of cheese on each piece of bread and pile on the mac n cheese on half of them. Once the bread is golden, flip the slices over the ones with the macaroni to create the sandwiches.