How long to cook a 250 g chicken breast at 375°F
Short answer
A 250 g (9 oz) boneless chicken breast takes 25 to 28 minutes at 375°F (190°C). Start checking at 19 minutes. It is done at 165°F (74°C) in the thickest part, and not a degree later.
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Cooking time
25 min
Start checking at
19 min
Safe internal temperature
165°F / 74°C
Rest
5 min
Two changes stack here, and both point the same way. The breast is a quarter heavier than a standard 200 g piece, and the oven is 25°F cooler — so this takes about eight minutes longer than the same breast at 400°F, not the two or three most people expect.
A lower oven is the better choice for a thick breast. At 375°F the outside has time to wait while heat travels to a centre that is genuinely deep, and you get an evenly cooked piece instead of a dry shell around a pink middle. The trade is browning: you will get less colour, which a hot pan for ninety seconds afterwards fixes if you want it.
Weight is a poor proxy for what actually decides the time, which is thickness. A 250 g breast butterflied into two flat pieces cooks in twelve minutes, not twenty-five — same weight, half the distance for the heat to travel. If dinner is late, that is the lever to pull.
Rest it for five minutes. On a piece this size the centre keeps climbing about 3°F after it leaves the oven, so pulling at 162°F lands you at 165°F on the plate rather than 170°F.
Related questions
Is 375°F or 400°F better for chicken breast?
400°F for pieces up to 200 g, 375°F for anything thicker. The thicker the breast, the more it benefits from heat that arrives slowly enough for the centre to keep up.
Can I cook it from frozen?
Yes, at 375°F, and add roughly half again to the time — about 40 minutes for a 250 g breast. Season it partway through, once the surface has thawed enough to hold anything.
Why is my chicken dry even at the right time?
Because time was never the test. Ovens run 15-25°F off their dial, breasts vary in thickness, and the difference between juicy and dry is five degrees. Measure the meat, not the minutes.