01 - Preheat oven to 350°F (175°C) and line two large baking sheets with parchment paper.
02 - In a large mixing bowl, beat softened butter, granulated sugar, and brown sugar using an electric mixer until the mixture is pale and fluffy.
03 - Add creamy peanut butter to the mixture, then incorporate the eggs one at a time, mixing thoroughly after each addition. Stir in vanilla extract.
04 - In a separate bowl, whisk together old-fashioned oats, all-purpose flour, baking soda, and salt.
05 - Gradually blend the dry ingredients into the wet mixture until just combined; do not overmix.
06 - Gently fold in red, white, and blue chocolate candies, semisweet chocolate chips, and crushed mini pretzels if using.
07 - Using a cookie scoop or rounded tablespoon, portion dough onto prepared baking sheets, spacing each two inches apart.
08 - Bake in the preheated oven for 10 to 12 minutes until edges are golden and centers appear slightly soft.
09 - Allow cookies to cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.