Gather oats, flour, sugar, butter, eggs, baking soda, salt, vanilla, and any add-ins like raisins or nuts
Preheat the oven to 350°F (175°C)
Line a baking sheet with parchment paper
Cream the butter and sugar together until smooth
Beat in the eggs and vanilla
In a separate bowl, mix the oats, flour, baking soda, and salt
Combine the dry ingredients with the wet ingredients
Stir in raisins, nuts, or chocolate chips if desired
Drop spoonfuls of dough onto the prepared baking sheet
Flatten slightly if needed
Bake for 10 to 12 minutes, or until golden brown
Remove from the oven and let the cookies cool on the baking sheet for a few minutes
Transfer the cookies to a wire rack to cool completely