01 - Preheat oven to 350°F (175°C). Line two large baking sheets with parchment paper.
02 - In a large mixing bowl, beat together softened butter, granulated sugar, and light brown sugar using an electric mixer until the mixture is pale and fluffy.
03 - Blend in creamy peanut butter followed by the eggs, adding one at a time and beating well after each addition. Stir in vanilla extract until incorporated.
04 - In a separate bowl, whisk together old-fashioned oats, all-purpose flour, baking soda, and salt until evenly mixed.
05 - Gradually incorporate the dry ingredient mixture into the creamed wet ingredients, mixing only until no streaks of flour remain.
06 - Using a spatula, gently fold in chocolate candies, semisweet chocolate chips, and mini pretzels if desired.
07 - Scoop rounded tablespoons of dough onto the prepared baking sheets, ensuring at least 2 inches between each portion.
08 - Transfer sheets to the oven and bake for 10–12 minutes, or until edges turn golden while centers remain soft.
09 - Allow cookies to cool on baking sheets for 5 minutes before transferring them to a wire rack to cool completely.