Gather all ingredients before starting the recipe.
Preheat oven to 450°F
Cut 3 red apples into 8 wedges, core and set aside.
Peel 1 large red onion, leaving root end intact and then slice into 6 wedges so each wedge remains connected to the end.
Line a sheet pan with non-stick aluminum foil.
Combine apples and onion wedges, season with kosher salt and freshly ground black pepper, drizzle with 1 tbsp olive oil, 1/4 cup balsamic vinegar and 2 tbsp maple syrup.
Bake in a preheated oven for 30 minutes, or until the apples and onion have browned and softened.
