01 - Preheat oven to 350°F and line two large baking sheets with parchment paper.
02 - In a large mixing bowl, beat together softened butter, granulated sugar, and light brown sugar until the mixture is pale and fluffy.
03 - Blend in creamy peanut butter. Add eggs one at a time, mixing thoroughly after each addition. Stir in vanilla extract to combine.
04 - In a separate bowl, whisk together old-fashioned oats, all-purpose flour, baking soda, and salt.
05 - Gradually add the dry mixture to the wet ingredients, stirring until just integrated.
06 - Gently fold in chocolate candies, semisweet chocolate chips, and crushed mini pretzels if using.
07 - Using a cookie scoop, drop rounded tablespoons of dough onto the prepared baking sheets, spacing each portion two inches apart.
08 - Transfer to the oven and bake for 10 to 12 minutes until the edges turn golden and centers remain soft.
09 - Allow cookies to cool on the baking sheets for five minutes, then transfer to a wire rack to finish cooling completely.