Cook pasta according to the instructions on the box. Drain after it’s cooked.
Preheat the oven to 400°F. Grease 9x9 baking dish and set aside.
Meanwhile, melt the butter in a sauce pan. Add tapioca flour and whisk until well combined. Cook over medium heat for a minute, it should become think.
Add milk and whisk again. Cook over medium heat for about 8 minutes or until the mixture starts to simmer. You need to whisk quite often not to have any lumps.
When the mixture starts to simmer, take the sauce pan off the heat and add shredded cheese to the saucepan. Whisk well until the mixture is smooth consistency.
Add the sauce to the cooked pasta and mix. Then transfer to the pre-greased baking dish.
Bake at 400°F for 20 minutes or until the top of the pasta gets golden/brown color.
Notes
1. To make this Gluten-Free Mac and Cheese, I used gluten-free pasta and tapioca starch. If you don't follow the diet, feel free to use regular pasta and all-purpose flour instead of tapioca flour.