Preheat the oven to 350°F. Spread flour on a small sheet pan and place in the oven for 5 minutes to heat-treat the flour so that it is safe for consumption.
In a large heat-proof mixing bowl, melt the butter in the microwave.
Place half of the chocolate pieces in the butter and whisk until the chocolate is melted and the mixture is smooth.
Whisk in the sugars - mixture will be grainy.
Mix in the vanilla extract.
Measure the cocoa powder and salt into a sieve. Add the heat-treated flour and then sift these ingredients into the butter/sugar mixture. Stir to combine everything into a thick batter.
Add the milk, a couple tablespoons at a time, and mix the batter with a wooden spoon until desired consistency is achieved.
Stir in the remaining chocolate chunks.
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Notes
Store in an airtight container in the refrigerator for up to 5 days or freeze for up to 3 months. Brownie batter is best served at room temperature.Notes:This is so rich and delicious, it tastes exactly like brownie batter. The sugars remain a bit grainy in the batter, which really mimics a true brownie batter.Melting some of the dark chocolate into the butter adds a dark chocolate richness to the batter. You could alternately melt in some milk chocolate and use milk chocolate chunks. Semi-sweet chocolate chips would also work. You could even skip the step of melting chocolate into the base and simply add the unsweetened cocoa powder and the chocolate pieces at the end.