Prep the basics. Heat your oven to 350°F (175°C). Line two baking sheets with parchment paper. This keeps cookies from sticking and helps them bake evenly.

Plump the raisins. In a small bowl, cover the raisins with warm water or orange juice and let them sit for 10 minutes. Drain well and pat dry with a paper towel. This keeps them soft in the final cookie.

Mix the dry ingredients. In a medium bowl, whisk together the flour, baking soda, baking powder, salt, and cinnamon. Set aside.

Cream the butter and sugars. In a large bowl, beat the softened butter, brown sugar, and granulated sugar until light and fluffy, about 2–3 minutes. This step creates air for a tender cookie.

Add eggs and vanilla. Beat in the eggs one at a time, scraping down the sides as needed. Mix in the vanilla. The batter should look smooth and slightly glossy.

Combine wet and dry. Add the flour mixture to the butter mixture. Mix on low until just combined. Avoid overmixing, which can make cookies tough.

Fold in oats and raisins. Stir in the oats and drained raisins by hand. If you’re using nuts, add them now. The dough will be thick and a bit sticky.

Chill briefly. Cover and chill the dough for 20–30 minutes. Chilling helps the cookies hold their shape and develop better texture.

Scoop and shape. Use a 1.5-tablespoon scoop or spoon to portion the dough onto the prepared sheets, spacing about 2 inches apart. For consistent thickness, gently flatten the tops with your fingers.

Bake. Bake for 10–12 minutes, until the edges are set and lightly golden but the centers still look a touch soft. Do not overbake—they’ll firm up as they cool.

Cool. Let the cookies rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely. This prevents breakage and keeps the centers chewy.