HEAT TREAT FLOUR: See note 1; you can heat treat flour in the microwave or in the oven. Test the flour to ensure it's reached a safe temperature of 165 degrees F. Let flour cool COMPLETELY to room temperature before using. Don't use any burnt or clumpy flour (if it's off color or smells burnt, it is most likely burnt). The flour should be light, white, and fluffy (it should look the same as it did before heat treating). Use a spoon to spoon the cooled flour into a measuring cup and level the top of the measuring cup with the back of a butter knife. (If you press and scoop flour in the measuring cup, you'll have too much)
DRY INGREDIENTS: Once the flour has cooled add the spooned and leveled 1 cup, 1/4 cup dutch process cocoa powder, and 1/2 teaspoon salt to a medium size bowl. Stir to combine and set aside.
BUTTER & CHOCOLATE: In a microwave safe bowl add 1 cup of semisweet chocolate chips and the 6 tablespoons butter (cut into 1 tablespoon pieces). Microwave in 30 second increments until fully melted, stirring for 15 seconds in between each increment. (This takes about 1 min 30 seconds in my microwave).
WET INGREDIENTS: In a bowl with a stand mixer attached (or use hand mixers) add the chocolate butter mixture. Add the 1/2 cup white sugar and 3/4 cup packed light brown sugar. Beat for 2 minutes on medium speed until completely smooth. Add the 1/4 cup + 2 tablespoons heavy cream and 1 teaspoon vanilla and beat until smooth and light, another 1-2 minutes.
COMBINE: Add the dry ingredients on top of the wet ingredients. Beat until just combined being careful to not over-mix the batter. Scrape the sides as needed with a spatula to make sure everything is well combined. Fold the 2/3 cup chocolate chips into the batter with a spatula. IF the dough is too wet (it should be a wetter brownie batter type consistency), add 1-2 more tablespoons heat treated flour and if it is too dry, add 1-2 more tablespoons heavy cream.
ENJOY: Add in any desired mix-ins and enjoy! We love this dough freshly made, chilled, or even frozen! This dough does get less grainy (as the sugar dissolves more) after being frozen or chilled.