Preheat oven to 350 degrees. Line baking sheets with silpat or parchment paper, set aside.

In a large bowl, beat together butter, oil, and peanut butter until creamy.

Add the sugars, vanilla, and eggs and beat until fluffy.

Mix in the salt, flour, and baking soda. Beat just until combined.

Stir in the Reese's pieces®.

I used an ice cream scoop {size 20/approximately 3 Tablespoons} to scoop my cookies. Place on prepared baking sheets leaving space for them to spread.

Bake for 15 minutes. Cookies will be set, but still gooey in the center.

Allow to cool on cookie sheet for 10 to 15 minutes, then move them to a wire cooling rack to cool completely.