Chocolate Peppermint Swig Cookies

INGREDIENTS

Eggs, large

4 1/2 cups

All-purpose flour

1/2 tsp

Baking soda

1/2 tsp

Cream of tartar

1 cup

Granulated sugar

1 1/2 tsp

Kosher salt

1 tsp

Peppermint extract

4 3/4 cups

Powdered sugar

1/2 cup

Oil

1 1/2 cups

Butter, unsalted

2 tbsp

Milk

1 1/2 cups

Sour cream

Ghirardelli peppermint bark

6 ounces Ghirardelli Bittersweet 60% Cacao Baking Chips, melted and cooled slightly

3/4 cup Ghirardelli 100% Unsweetened ground cocoa