Yes, but you don't need to get exactly 12 slices per peach! I find smaller slices are easier to eat and maximize the contact between the juicy peaches and glaze, plus they cook faster. You might prefer thicker slices and can do that or even use peach halves- when cooking those start with the cut side down. The cook time will be a bit longer, they're ready when tender and you can cut them with a spoon.