Preheat oven to 350 degrees. Line a muffin tin with muffin liners.
In a bowl, combine flour, baking soda, salt, cocoa powder, brown sugar, cinnamon and mix until combined. Using a whisk, stir in the egg, vanilla, melted butter and milk. If the dough still appears too dry, add another tablespoon or 2 of milk. Fold in blueberries and chocolate.
Using an ice cream scoop, spoon muffins into liners. Bake for 13-16 minutes, or until muffins are cooked through.
Course: Breakfast
Cuisine: American
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