Step 1: Sauté the Vegetables

1. In a large skillet, melt the butter over medium heat.
2. Add the chopped onion, celery, mushrooms, and parsley.
3. Cook for 5–8 minutes, stirring occasionally, until the vegetables are softened.

Step 2: Combine Bread Cubes and Vegetables

1. Place the dry bread cubes in a large mixing bowl.
2. Add the sautéed vegetables and toss to combine.

Step 3: Season the Stuffing

1. Sprinkle the bread and vegetable mixture with salt, sage, poultry seasoning, thyme, marjoram, and black pepper.
2. Toss until the seasonings are evenly distributed.

Step 4: Add Broth and Eggs

1. Gradually pour in enough chicken broth to moisten the bread cubes.
2. Add the beaten eggs and mix well until everything is fully combined.

Step 5: Transfer to Slow Cooker

1. Lightly grease the inside of your slow cooker.
2. Pour the stuffing mixture into the slow cooker and spread it out evenly.

Step 6: Cook the Stuffing

1. Cover and cook on High for 45 minutes.
2. Reduce the heat to Low and cook for an additional 4–8 hours, stirring occasionally.

Step 7: Serve and Enjoy

1. Once cooked, fluff the stuffing with a fork and serve it hot alongside your favorite main dishes.