Preheat oven to 350°F/180°C. Line two baking sheets with parchment paper and set aside.

In a large bowl, sift together flour, baking soda, and salt. Set aside. In a standing mixer fitted with the paddle attachment, beat butter and sugars for 2-3 minutes, until fluffy. Beat in peanut butter, vanilla, and egg, and beat well until combined. Add flour mixture and beat on low speed just until combined. Don’t over mix. Add in oatmeal, candies, and chocolate chips, and keep mixing on low just until combined. The less you mix, the softer the cookies will be.

Drop rounded balls of dough onto prepared baking sheets, the size of 2 tablespoons each (I use an ice cream scoop), spacing them 2 inches apart. Bake for 9-12 minutes, until cookies just begin to brown at the edges and center is still soft. Cookies will appear undone and moist in the center, but will continue to bake on the warm baking sheet. Leave to cool for 10 minutes, then transfer to a wire rack to cool completely.

Store cookies in an airtight container at room temperature for up to 4 days, or freeze for up to 2 months. To thaw, leave on counter, still covered, or overnight in the fridge.