Preheat oven to 450°F. Line a baking sheet with parchment paper.
Melt 2 tablespoons butter and toss with the apples, maple syrup, chili powder, salt and pepper. Arrange apple slices on prepared baking sheet in an even layer.
½ cup butter, 2 large apples, cored and sliced ¼-inch thick, 2 tablespoons pure maple syrup, ½ teaspoon chili powder, ½ teaspoon salt, ¼ teaspoon pepper
Bake in the preheated 450°F oven for 20 minutes, or until soft and starting to brown. Set aside to cool.
In a large frying pan, melt 1 tablespoon butter over medium heat. Add onion and toss to coat.
1 sweet onion, thinly sliced
Allow onion to cook without stirring it for 15-20 minutes or until it begins to develop a deep brown color.
Add the apricot preserves and dijon to the onions and stir to combine. Continue to cook for 2 more minutes, stirring frequently. Remove from heat and allow to cool slightly.
4 teaspoons apricot preserves, 4 teaspoons dijon mustard
Spread butter on one side of 4 slices of bread. On the unbuttered side, top with Muenster, apples, chicken, onions, pecans and another slice of muenster. Close the sandwich with another slice of buttered bread, buttered side up. Repeat with the other 3 sandwiches.
¾ pound Muenster cheese, thinly sliced, ½ pound thinly sliced rotisserrie chicken, 8 slices sourdough bread, 1 cup pecans, coarsely chopped and toasted
Heat the panini press, cook sandwiches until bread is golden and toasted. Remove from the panini press, slice and serve.