Preheat the oven to 350°F and line an insulated cookie sheet with parchment paper. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, cream together the softened 1/2 cup salted butter, ¼ cup vegetable oil, and ¾ cup sugar until light and fluffy, approximately 2 minutes.
Mix in the 2 eggs and 1 tablespoon vanilla extract and mix until creamy.
Whisk or sift together the 2 cups flour, 1 cup Dutch processed cocoa powder2 teaspoon baking powder, 1 teaspoon baking soda and ½ teaspoon cream of tartar.
Add half of the dry ingredients to the wet ingredients and mix well. Scrape down the sides of the bowl. Add the remaining dry ingredients, and mix thoroughly. Fold in the 2 cups crushed Oreos* by hand.
Using a 2 tablespoon cookie scoop, scoop the dough into equally sized cookie dough balls (10 cookies). Place the cookies 3 inches apart on the prepared cookie sheet.
Press the cookie to 1/2 inch thickness using the bottom of a glass or measuring cup.
Bake the cookies for 10 minutes or until they are slightly shiny. Cookies will look a little undercooked, but this is when to remove them!
Allow the cookies to cool on the baking sheet for 2 minute then transfer to a wire cooling rack. Frost when fully cooled.
Oreo Cookie Frosting:
In the bowl of a stand mixer fitted with the paddle attachment, combine the softened 1/2 cup salted butter, 3 cups powdered sugar, 2 tablespoons heavy cream and 1 teaspoon vanilla extract. Mix until well combined, stopping to scrape down the sides of the bowl.
Using a Ziploc bag with the corner cut off or a piping bag fitted with a small round tip, pipe frosting on top of cookies in a circular motion.
Garnish with crushed 1/2 cup Crushed Oreos.
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Notes
In some markets you will be able to find crushed Oreos in a box instead of doing it yourself. Refrigerator: Store cookies in a single layer an airtight container or ziploc bag for up to 5 days. You can also individually wrap them in plastic wrap.Freezer: Freeze these cookies in a freezer-safe container or freezer bag for up to 3 months.