In a large skillet, saute garlic in butter for 1 minute.Pierce casings all over with knife or use a fork. Add brats and brown, when browned add 4 ounces bear and saute until cooked through. Remove from pan and set aside.
To make gravy add rest of ingredients except for corn starch and 2 ounces beer and bring to a boil. Mic cornstach and 2 ounces of beer and make a slurry. Lower gravy to simmer and stir in cornstarch mixture.
If gravy is too thick add more meer or too thin add more beer mixed with cornstarch. Do not add dry cornstarch directly to hot gravy it will make your gravy lumpy.