The temperature to bake chicken depends on the recipe and the size of the chicken breasts. According to the search results, the most common temperature to bake chicken breasts is 375°F to 425°F. For example, to bake chicken breasts at 400°F, it will take between 22 and 26 minutes depending on the size of the chicken breasts. Another recipe suggests baking chicken breasts at 425°F for 14 to 25 minutes depending on the size of the chicken breasts. A third recipe recommends baking chicken breasts at 450°F for 15 to 18 minutes, depending on the thickness of the chicken breasts. To ensure that the chicken is fully cooked, it is recommended to use an instant-read thermometer to check the internal temperature of the chicken. The thickest part of the breast should measure 165°F. After baking, it is important to let the chicken rest for at least 5-10 minutes before slicing to lock in juice and flavor.