The baking time for chicken breasts in an electric oven can vary depending on the size and thickness of the chicken breasts, as well as the temperature at which you are baking them. As a general guideline, boneless, skinless chicken breasts that are approximately 4 to 6 ounces each typically take about 20 to 30 minutes to bake at 375°F (190°C).
To ensure that the chicken breasts are cooked thoroughly and reach a safe internal temperature, it's essential to use a meat thermometer. Insert the thermometer into the thickest part of the chicken breast, without touching the bone if there is one. The chicken breasts are considered safe to eat when the internal temperature reaches 165°F (74°C).
Keep in mind that these are approximate times, and it's always best to rely on a meat thermometer to determine the doneness of the chicken. Cooking times may vary depending on the specific oven and the thickness of the chicken breasts, so it's essential to monitor the chicken's internal temperature for accurate results.