 Have you ever wondered why that first batch of chocolate chip cookies takes longer to bake than the rest of the batches? Well, if you're using a new energy efficient oven, here's the reason why. In the old days, we used to preheat the oven for 10 minutes, but now it takes 20 minutes. And the reason it takes longer is because the original ovens that first came out, the heating oven would be on for the entire duration of the preheat cycle, and it would heat the oven up quickly, where with the new ones, they cycle on and off, and it takes longer. They use less electricity, obviously, but it takes longer to heat it, so 20 minutes is now what the recommended standard for heating it is, and your cookies take 10 to 12 minutes, so your first batch is usually not cooked thoroughly. So look for more Frith Quick Tips on YouTube.