Add the muffins and stir gently to coat. Cover the bowl with plastic wrap and let stand at room temperature for 1 hour. Alternatively, refrigerate the mixture for several hours or overnight.
Melt 1 tablespoon of the butter in a 12-inch oven-safe skillet (such as stainless steel or a well-seasoned cast iron pan) over medium-high heat. Add the sausage and cook, breaking into smaller pieces with a spoon, until browned, about 4 to 5 minutes. Transfer sausage to a bowl with a slotted spoon.Melt 1 tablespoon of the remaining butter in the skillet and add the onion and poultry seasoning. Sauté, stirring occasionally, until the
Seasonal Alternatives: For the Spring substitute 8 ounces of diced cooked ham for the sausage, 12 ounces of steamed or roasted asparagus (cut into 1-inch pieces) for the apple and 2 cups shredded Swiss or Gruyere cheese for the cheddar. For the Summer substitute 4 ounces of chopped smoked salmon for the sausage and 2 cups sautéed mixed summer vegetables such as zucchini, yellow squash, bell pepper and grape tomatoes. Sprinkle the filling with 1 1/2 cups crumbled feta cheese and bake without any additional cheese on top.