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Prepare muffins by combining flour, sugar, baking powder, cinnamon, and salt in a large mixing bowl.
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Combine the coffee creamer and coffee granules in a bowl and stir until the granules dissolve.
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Stir the butter, sour cream, egg, and vanilla into the milk mixture.
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Add the milk mixture to the flour mixture and stir just until moistened.
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Fill greased muffin cups ⅔ full. (*I used jumbo muffin tins)
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Prepare streusel by combining ingredients in a small bowl and mixing until crumbly.
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Divide streusel topping evenly among muffins.
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Bake at 375 degrees approx. 20 minutes or until tops are golden brown.
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Cool in pans for 5 minutes, then remove muffins to a wire rack to cool completely.
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Prepare drizzle by combining ingredients in a small bowl; drizzle over tops of muffins.