Ingredients
- 4-1/2 cups all-purpose flour
- 3 teaspoons cream of tartar
- 1-1/2 teaspoons baking soda
- 1 teaspoon salt
- 1-1/2 cups (3 sticks) butter, room temperature
- 1-1/2 cups granulated sugar
- 3/4 cup light brown sugar, packed
- 2 eggs
- 1 egg yolk
- 3 teaspoons vanilla
- 1 cup toffee bits
- 1-1/2 cups butterscotch chips
- 1 cup milk chocolate chips
- 1-1/2 cups mini marshmallows
Instructions
Preheat oven to 325°.
In a large stand mixer, cream the butter and sugars together until light and fluffy, about 6 minutes. Add the eggs and vanilla, 1 at a time, making sure to incorporate well after each addition. Scrap the sides and bottom of the bowl before adding the dry ingredients.
Combine the flour, cream of tartar, baking soda and salt in a bowl. Slowly add the dry ingredients to the butter mixture, making sure to scrape the sides of the bowl. Add the toffee, butterscotch, chocolate chips and marshmallows. Using a 2-ounce scoop, (or measure out 2 tablespoons), scoop the dough onto a greased, parchment paper lined baking sheet. Make sure to leave at least 2 inches between the cookies. Bake for about 12 minutes, until the cookies are light golden brown and slightly firm.