Buttery Blueberry Streusel Muffins

packed dark or light brown sugar

pecans or walnuts, chopped

ground cinnamon

unsalted butter, softened to room temperature

granulated sugar

packed light or dark brown sugar

large eggs, room temperature preferred

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vanilla extract

and 3/4 cups (220g) all-purpose flour (measured correctly)

baking soda

baking powder

salt

milk (any kind)

and 1/2 cups (250g) fresh or frozen blueberries (do not thaw if using frozen)