Preheat the oven to 350℉.
Using a large mixing bowl, whisk together the butter, both sugars, eggs, and vanilla extract.
½ cup butter, softened to room temperature, ½ cup granulated sugar, 1 cup light brown sugar, packed, 2 large eggs, at room temperature, 2 teaspoons vanilla extract
In a separate bowl, stir together the dry ingredients of flour, baking soda, and cinnamon.
1 ½ cups all purpose flour, 1 teaspoon baking soda, ½ teaspoon ground cinnamon
Add the dry ingredients to the wet ingredients and mix together. Don't overmix, though.
Finally, stir in the oatmeal and raisins until evenly distributed throughout.
2 cups old fashioned rolled oats, 1 cup raisins
With a spoon, scoop out some dough and roll into 1" to 1-½" balls. Place on a lined baking sheet.
Bake on the middle rack of the oven at 350℉ for 10-12 minutes.
Let cool on a cooling rack for a few minutes, then enjoy!