01 - Preheat oven to 350°F and line two large baking sheets with parchment paper.
02 - In a large mixing bowl, beat butter, granulated sugar, and brown sugar together with an electric mixer until light and fluffy.
03 - Mix in peanut butter until fully blended, then add eggs one at a time, beating well after each addition. Stir in vanilla extract.
04 - In a separate bowl, whisk oats, flour, baking soda, and salt together.
05 - Gradually add the dry mixture to the creamed wet ingredients, stirring just until combined.
06 - Gently fold in chocolate candies, chocolate chips, and pretzels if using.
07 - Scoop rounded tablespoons of dough onto prepared baking sheets, spacing each about two inches apart.
08 - Bake 10 to 12 minutes, until edges are golden and centers remain soft.
09 - Let cookies rest on baking sheets for five minutes, then transfer to a wire rack to cool completely.