01 - Preheat oven to 350°F and line two large baking sheets with parchment paper.
02 - In a large bowl, combine softened butter, granulated sugar, and light brown sugar. Beat with an electric mixer until the mixture is light and fluffy.
03 - Mix in creamy peanut butter until smooth. Add eggs one at a time, beating well after each addition. Incorporate vanilla extract.
04 - In a separate bowl, whisk together old-fashioned oats, all-purpose flour, baking soda, and salt.
05 - Gradually mix dry ingredients into the wet mixture, stirring until just combined.
06 - Carefully fold in the chocolate candies, semisweet chocolate chips, and pretzels if using.
07 - Scoop rounded tablespoons of dough onto prepared baking sheets, spacing each mound two inches apart.
08 - Bake for 10 to 12 minutes until the edges are golden and the centers remain soft.
09 - Allow cookies to cool on baking sheets for five minutes, then transfer to a wire rack to cool completely.