These gluten free coffee cake muffins are rich with sour-cream and spiked with a cinnamon crumb topping. They are so beautiful and tasty that not a single soul will know they are gluten-free unless you tell them. Prefer metric weights instead of cups? Toggle the button below!
Preheat oven to 400 °F. Grease a muffin tin or line with paper cups.
Place butter in the bowl of a stand mixer fitted with a paddle attachment (or large mixing bowl if you are using a hand mixer). Beat together the butter and sugar until fluffy. Add eggs, one at a time and mix until combined. Stir in vanilla extract.
In a smaller bowl, sift together dry ingredients, then gently stir into the butter mixture, in two additions, alternating with the sour cream. Mix just until combined.
Make streusel. Mix dry ingredients together. Cut in butter using a pastry cutter, two knives, or your fingers, until the mixture resembles coarse sand.
Using a 1/3 cup muffin scoop, fill each muffin cup about 2/3 full. Top evenly with streusel. Bake for about 18 minutes, or until a toothpick inserted into the middle of the muffin comes out clean.
Whisk the maple syrup into the powdered sugar, one tablespoon at a time until it becomes a drizzle-able consistency. Drizzle evenly over the muffins by letting it run off a spoon. (This works best if the muffins are cooled as it will sink into the muffin a little if they are still warm--which won't affect the flavor, of course).