Oatmeal cookies get a bad reputation from bakery versions that are basically hockey pucks, but the texture comes down to two things: not overbaking, and using old-fashioned oats rather than quick oats for real chew.
This version leans into cinnamon and keeps the mix-in choice flexible between classic raisins or chocolate chips.
Pull the cookies while the centers still look a touch soft — like most cookies, they firm up on the pan after coming out, and overbaking is what turns oatmeal cookies dry and cakey.
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Whisk together oats, flour, baking soda, cinnamon and salt in a bowl.
Beat the butter with both sugars until light and fluffy, about 2-3 minutes.
Beat in the egg and vanilla until combined.
Gradually mix in the dry ingredients until just combined, then fold in raisins or chocolate chips.
Preheat oven to 350°F (175°C). Drop rounded tablespoons of dough onto a lined baking sheet, spaced 2 inches apart. Bake for 10-12 minutes until the edges are golden and the centers still look slightly soft.
Old-fashioned rolled oats hold their shape and give more distinct chewy texture — quick oats are cut smaller and will bake into a softer, less textured cookie, though they work in a pinch.
This usually comes from overbaking — pull them while the centers still look a little soft, since they firm up as they cool on the pan.
Yes — chocolate chips, dried cranberries or chopped walnuts all work as a direct swap for the raisins in equal amounts.