Preheat oven to 375 degrees.

Thinly slice russet potatoes and set aside.

Melt butter over medium low heat in a saucepan. Mince garlic and add it to butter. Cook for about 1 minute, stirring constantly.

Add flour and stir until flour is dissolved. Add heavy cream and cook over medium low heat until mixture thickens, about 5 minutes. Season with salt and pepper to taste.

Remove from heat and add blue cheese. Stir to combine.

Spread some of the potatoes evenly on the bottom of a 2 qt casserole dish. Add enough blue cheese sauce to cover the potatoes, then add some shredded parmesan cheese on top of this layer. Continue with these layers (potatoes, blue cheese sauce, shredded parmesan cheese) until you have about 4 layers, finishing with the parmesan cheese on top.

Bake in preheated oven uncovered for 50 minutes or until potatoes are tender. Enjoy :)