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In a small saucepan, melt the butter over medium-low heat. Continue stirring until it turns brown and nutty in aroma. Remove from heat and cool for 5 minutes.
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Add the flour, brown sugar, and nuts, and stir with a fork until it resembles clumps of sand.
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Spoon about a tablespoon of the streusel on top of each muffin, making sure that the batter is covered.
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Bake for 20 minutes or until toothpick inserted in the center comes out clean. Cool down.