01 - Set oven to 350°F (175°C). Line two large baking sheets with parchment paper.
02 - In a large mixing bowl, blend softened butter, granulated sugar, and brown sugar until the mixture is light and fluffy.
03 - Add peanut butter to the creamed mixture. Beat in eggs one at a time, mixing thoroughly after each addition. Stir in vanilla extract.
04 - In a separate bowl, whisk together oats, all-purpose flour, baking soda, and salt.
05 - Gradually mix the dry ingredients into the wet mixture, stirring until just combined.
06 - Gently fold in the red, white, and blue chocolate candies, semisweet chocolate chips, and mini pretzels if using.
07 - Scoop rounded tablespoons of dough onto prepared baking sheets, leaving two inches of space between each.
08 - Bake in preheated oven for 10 to 12 minutes, or until edges are golden and centers remain soft.
09 - Let cookies cool on the baking sheets for five minutes, then transfer to a wire rack to cool completely.