How can you make your oatmeal raisin cookies thicker?

To make your oatmeal raisin cookies thicker, you can increase the amount of flour slightly or add a bit more oats to the dough. Chilling the dough in the refrigerator for at least 30 minutes before baking can also help them hold their shape. Additionally, using less sugar or opting for brown sugar can contribute to a denser texture. Lastly, avoid overmixing the dough, as this can lead to thinner cookies.