01 - Preheat oven to 350°F and line two large baking sheets with parchment paper.
02 - In a large bowl, cream butter, granulated sugar, and brown sugar together with an electric mixer until light and fluffy.
03 - Blend in peanut butter, then add eggs one at a time, mixing thoroughly after each addition. Mix in vanilla extract.
04 - Whisk oats, all-purpose flour, baking soda, and salt together in a separate bowl.
05 - Gradually add dry ingredients to wet mixture, mixing just until combined.
06 - Gently fold in chocolate candies, semisweet chocolate chips, and pretzels if using.
07 - Scoop rounded tablespoons of dough onto the prepared baking sheets, spacing about two inches apart.
08 - Bake for 10 to 12 minutes, until cookie edges are golden but centers remain soft.
09 - Allow cookies to cool on baking sheets for 5 minutes before transferring to a wire rack to cool completely.