Start heating a large pan on medium high heat.

Lightly oil the bottom of the pan and brown brats on both sides.

Pour in 1 1/2-2 cups of beer and 1/4 cup water and cover, reducing the heat to medium.

Peel and slice the onions, adding them to the pan as you go.

Sprinkle garlic salt into the pan, cover again and let it cook until the onions are soft, this takes me about 30 minutes because I forget about them but it's ok because some flavorful magic happens.

Add sliced mushrooms.

Cook for 5-7 minutes until the mushrooms are tender.

Now crank the heat back up to medium high, uncover and cook off some of that liquid for maybe another 5 minutes or until the pan juices thicken a little.

I highly recommend toasting the buns and putting some mozzarella cheese directly on the brat and under the onions and mushrooms.

Heaven in a toasted bun!