Whisk together the applesauce, soy sauce, brown sugar, garlic, chili powder, smoked paprika, and black pepper in a bowl.
Place chicken breasts in a zip-top bag or shallow dish. Pour the marinade over the chicken and coat evenly. Refrigerate for at least 30 minutes (1-4 hours is ideal).
Preheat oven to 400°F. Place marinated chicken in a baking dish and pour a thin layer of marinade over the top.
Bake for 22-25 minutes until the internal temperature reaches 165°F and the surface is golden brown.
Let rest for 5 minutes before slicing and serving.
Notes
Marinating time: Minimum 30 minutes, ideal 1-4 hours. Do not exceed 12 hours or the texture may become mushy.
Grilling: Pat chicken lightly dry before grilling to prevent flare-ups. Grill 6-7 minutes per side at medium-high heat.
Slow cooker: Pour marinade over chicken breasts and cook on LOW for 3-4 hours or HIGH for 2 hours.
Freezer meal: Place raw chicken and marinade in a freezer bag. Freeze up to 3 months. Thaw overnight in fridge and cook as directed.
Chicken thighs: Work great as a substitute and are more forgiving with cook time.