Heat oven to 375 degrees. Coat a 13 x 9 x 2-inch baking dish with nonstick cooking spray. Set aside. Cut bread into 1-inch slices. Place directly on oven rack and toast 3 to 4 minutes. Flip over and toast an additional 4 minutes, until dry to the touch. Let cool until you can handle slices.Advertisement
Melt butter in a large lidded nonstick skillet set over medium heat. Crumble in bratwurst and cook, breaking apart with a wooden spoon, 4 minutes. Add celery, onion, carrots and sage and cook, covered, 5 minutes. Stir in beer, salt and pepper and cook, uncovered, 2 minutes.
Cut toasted bread into 1-inch cubes and place in a large bowl. Carefully pour in contents of skillet and stir to combine. Transfer dressing to prepared baking dish and drizzle with stock (adding more if needed). Bake at 375 degrees for 30 minutes. To make ahead: Prepare dressing and place in prepared dish (don't drizzle with stock). Refrigerate. Bring to room temperature and drizzle with stock. Bake at 375 degrees for 30 minutes or until hot.