Preheat the Oven:

Set your oven to 350°F (175°C) and line baking sheets with parchment paper or silicone baking mats.

Mix Wet Ingredients:

In a large bowl, cream together the peanut butter, softened butter, granulated sugar, and brown sugar until smooth. Add the eggs and vanilla extract, beating until combined.

Combine Dry Ingredients:

In a medium bowl, whisk together the oats, flour, baking soda, and salt.

Combine Wet and Dry Ingredients:

Gradually add the dry ingredients to the wet ingredients, mixing just until combined.

Fold in the Mix-ins:

Gently fold in the chocolate chips and candy-coated chocolates with a spatula.

Shape the Cookies:

Use a cookie scoop or tablespoon to drop dough onto the prepared baking sheets, spacing the cookies about 2 inches apart.

Bake:

Bake for 10–12 minutes or until the edges are lightly golden. The centers will still look slightly underbaked but will firm up as they cool.

Cool:

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