Pre heat oven to 375°
Line a sheet pan with non-stick aluminum foil, or regular foil and spray with vegetable spray
Peel and slice one large or 2 medium Spanish onions and place on sheet pan, spreading out so the onions are evenly distributed; drizzle with olive oil and season with salt and pepper
Slice a baguette in half, then half length wise and then cube into 1/2 - 1 inch pieces
Place marinated chicken, skin side up, on top of the onions
Top with cubes of bread, tucking the bread around and under the chicken
Bake in a pre heated oven for 30-45 minutes, or until the chicken is nicely browned and the onions and bread toasted.