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Chocolate Streusel Filling
3 tbsps (1.5 ounce/40 gms) firmly packed, light brown sugar, preferably Muscovado
2 tbsp plus 1-1/2 tsp (0.5 ounce/12 gms) sifted before measuring, unsweetened (alkalized) cocoa powder
Make the Chocolate Streusel Filling : In a small bowl, stir together the brown sugar, cocoa and cinnamom. Use a fork or your finger tips to break up the sugar, if necessary.
Batter
1-3/4 cups (7 ounces/200 gms) sifted into the cup and leveled off, bleached all-purpose flour
1/4 plus 1/8 tsp baking soda
8 tbsp (1 stick/4 ounces/113gms) unsalted butter
1 cup (7 ounces/200 gms) superfine sugar (I use 160gm)
1 cup (8.5 ounce/242 gms) sour cream