1. Mix together the water and kosher salt to create a brine; soak the chicken breasts in the brine for 15-30 minutes (this will make them super juicy when cooked!); when done brining, rinse chicken off in cold water and pat dry with paper towels.
2. Preheat oven to 450 F and mix together the garlic powder, paprika, dry rosemary, black pepper and salt (option to decrease the salt to 1/2 tsp if you like things less salty).
3. Brush the chicken breasts with olive oil and drizzle with lemon juice; sprinkle with a generous amount of the seasoning mix.
4. Bake for 15-20 minutes until a meat thermometer reads 165 F.
5. Place chicken on a plate and cover with foil; let rest for 5 minutes before serving.
