After about 20 minutes, you should turn on the oven to about 375º and start preparing your batter.
Stir together the flour, baking powder, salt, and milk with a wooden spoon. Next, stir in the melted butter and hand-mix it until the ingredients are well incorporated and you have few clumps.
Pick out a clean baking dish– a smaller one will do– pour in the batter and smooth it out. You can choose to line it with parchment paper or not, but don’t grease the pan (there is enough butter in there already!). Finally, pour the macerated blackberries on top with all the sugar included and evenly distribute it over the batter.
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