[header] How to make oatmeal raisin cookies [title] Heat the oven to 350ºf. [step] Line baking sheet with a parchment paper, or spray it with a non-stick cooking spray to ensure that the cookies can be removed cleanly when finished. [title] Beat together butter and sugar with a hand mixture. [step] Add the room-temperature butter, white sugar, and brown sugar into a large mixing bowl and slowly increase the speed on your mixer. 
You want everything to be blended and the mixture to be light and fluffy. [title] Add eggs and vanilla, mixing until completely incorporated.