Oktoberfest Bacon Beer Mac and Cheese Bake

Preheat the oven:
Set your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish or similarly sized oven-safe dish and set aside.
Cook the macaroni:
Bring a large pot of salted water to a boil. Add the elbow macaroni and cook according to package instructions until just al dente. Drain well and set aside. The pasta will continue to soften slightly while baking.
Prepare the cheese sauce:
In a large saucepan, melt the butter over medium heat. Once fully melted and bubbling, whisk in the flour to create a smooth roux. Cook the roux for 1 to 2 minutes, whisking constantly, to eliminate any raw flour taste and ensure a silky sauce base.
Add liquids:
Slowly pour in the milk and Oktoberfest beer while continuing to whisk. Cook the mixture for 4 to 6 minutes, stirring frequently, until thickened to a creamy consistency that coats the back of a spoon.