Add butter, brown sugar and granulated sugar to a medium mixing bowl, sprinkle salt evenly over.
Using an electric hand mixer whip together until pale and fluffy, about 3 minutes.
Mix in 1 1/2 Tbsp milk and the vanilla extract.
Add in flour and blend just to combined, while adding milk 1/2 Tbsp at a time to thin if needed.
Using a rubber spatula fold in chocolate chips.
FOR CHOCOLATE CHOCOLATE CHUNK COOKIE DOUGH: replace 1/3 cup of the all-purpose flour with 1/3 cup (32g) dutch process cocoa powder. Mix cocoa in with the flour. Replace mini chocolate chips with 2 oz. dark chocolate chopped into small bits.
FOR FUNFETTI SUGAR COOKIE DOUGH: omit brown sugar, use 2/3 cup (136g) granulated sugar (total). Add 1/4 tsp almond extract in with the vanilla extract. Replace chocolate chips with 1/3 cup (52g) white chocolate chips. Fold in 3 Tbsp rainbow jimmies sprinkles with white chocolate chips, serve with more sprinkles on top.
*To heat treat flour: preheat oven to 350 degrees. Evenly spread 3 cups all-purpose flour onto a rimmed 18 by 13-inch baking sheet. Bake in preheated oven 7 minutes or until flour registers 160 degrees on an instant read thermometer. Cool completely store in an airtight container.
**Nutrition listed is for chocolate chip cookie dough.
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