Chocolate Sugar Cookies are soft cookies full of chocolate flavor and topped with a creamy homemade chocolate frosting.
In the bowl of a stand mixer, combine the butter, granulated sugar, and confectioners' sugar, and mix until just combined.
Drizzle in oil and pour in eggs, water, and vanilla extract and mix well.
In another bowl, whisk together flour, cocoa, salt, baking soda, and cream of tartar.
Slowly add the flour mixture to the butter mixture and allow the mixer to combine until the dough pulls away from the sides of the mixer bowl.
NOTE: It is important to NOT over-bake the cookies. Be sure to check your cookies at 7 minutes. Every oven is different and overbaking can result in a tough, crumbly, tasteless cookie. Let your first batch be a test batch so you can ensure the remaining cookies are perfect and soft!
Spread over cooled cookie using an offset spatula or butter knife