Creamy French Chicken

Ingredients

• 1 whole chicken (or 4 chicken breasts, cut into big chunks)
• 2/3 cup French dressing
• 2/3 cup Italian dressing
• 2/3 cup white vinegar
• 1/2 cup brown sugar
• 1 small onion, diced
• 1 garlic clove, diced
• small jar of sliced mushrooms