1. Combine butter, peanut butter, brown sugar, and granulated sugar in a bowl and cream until light and fluffy.

2. Beat in eggs one at a time and then stir in vanilla extract.

3. Whisk oats, baking soda, and salt in a separate bowl and then fold into the wet mixture to form a thick dough.

4. Gently stir in chocolate chips and candy-coated chocolates until evenly distributed.

5. Cover the dough and refrigerate for at least 30 minutes.

6. Preheat the oven to 350°F (175°C) and line baking sheets with parchment paper.

7. Scoop dough into 2-tablespoon balls and place on prepared sheets, spacing them apart.

8. Bake for 10 to 12 minutes until edges are golden and centers are set but still soft.

9. Let cookies cool on the baking sheet for 5 minutes, then transfer to a cooling rack to cool completely.