Preheat oven to 375°F. Line a baking pan with aluminum foil and rub both sides of chicken breasts with olive oil
In a medium bowl, mix together the spices and sugar (brown sugar, paprika, thyme, rosemary, and garlic powder)
Place a chicken breast in the spice bowl and coat both sides with spice mixture. Place back on baking pan. Repeat for all remaining chicken breasts.
Bake chicken for 30 minutes or until cooked all the way through. Move onto the chicken salad prep
Let chicken cool, then cut into small cubes and store in an airtight container in the fridge overnight. (You can also wait to cut the chicken until the morning!)