The baking time for chicken breast depends on its size, thickness, and oven temperature, but generally:

• Bake at 400°F (204°C) for about 20-25 minutes for medium-sized breasts (around 7 oz). Smaller breasts (5 oz) take 18-20 minutes, and larger breasts (9 oz) take 22-25 minutes

• For thinner breasts (about 1/2 inch thick), bake 16-18 minutes; for 3/4 inch thick, 20-22 minutes; and for 1 inch thick, 24-26 minutes

• At higher temperatures like 425°F (220°C), medium breasts take about 18-20 minutes

• The key is to bake until the internal temperature reaches 165°F (75°C) to ensure safety and juiciness. Removing the chicken at about 160°F (71°C) and letting it rest allows carryover cooking to reach 165°F without drying out the meat

• Rest the chicken for 5-10 minutes after baking to retain juices

In summary, bake chicken breasts at 400-425°F for about 18-25 minutes depending on size and thickness, and always check the internal temperature to reach 165°F for safe and juicy results.