Preheat oven to 350 & line muffin tin with paper liners
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Make the streusel topping by combining flour through melted butter. Stir until big clumps form , then refrigerate
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Combine second quantity of flour through cinnamon and whisk until combined well
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Add melted butter through yogurt to the dry ingredients and stir. Mix together brown sugar & cinnamon to make cinnamon layer
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Scoop 1/2 the batter into the muffin papers. Distribute cinnamon sugar layer evenly among the tins and top with remaining batter. Top muffins with streusel. Theyre gonna be big boys
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Bake 23 minutes. Watch the tops so the streusel doesnt get too brown. They should be ok at 23 minutes
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Try to bake them early enough so that they can sit undisturbed for 30 minutes or so. If you eat them right away they'll be gummy