Cinnamon Bubble Buns
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For the dough:
1 package active dry yeast (2 1/4 tsp)
1/4 cup warm water
3 Tbsp. unsalted light butter, melted
2/3 cup low-fat sour cream
3 Tbsp. sugar
1 large egg
1 tsp. vanilla extract
2 1/2 cups all-purpose flour, plus more for kneading
1/2 tsp. salt
1/4 tsp. baking soda
For the cinnamon-sugar coating:
2/3 cup packed light brown sugar
2 tsp. cinnamon
6 Tbsp. unsalted light butter, melted
For the vanilla glaze:
1 1/4 cups powdered sugar
1 Tbsp. unsalted light butter, melted
1 Tbsp. milk
1 tsp. vanilla extract
In a large mixing bowl, sprinkle the yeast over the water and let it stand until bubbly, 5 to 10 minutes. Stir in the butter, sour cream, sugar, egg and vanilla. Beat in 2 cups of the flour, salt and baking soda until combined. Add the remaining 1/2 cup flour and continue mixing until a smooth, soft dough forms.
Turn the dough out onto a lightly flour surface (keep your mixing bowl handy) and knead it until smooth, about 3 minutes. As you knead, add more flour if the dough is sticky, no more than 2 Tbsp. though. Place the dough back in the mixing bowl and cover with plastic wrap. Let the dough rise in a warm place until doubled in size, about 1 hour.
Lightly grease a 12-cup muffin pan, then flour the cups and tap out the excess. In a small bowl, blend the sugar and cinnamon for the coating. Place the melted butter in a small dish and set aside. Gently punch down the dough to deflate it. Form it into a long cylinder and divide it into 12 equal portions. Using kitchen scissors or a sharp knife, divide each of the 12 portions into 6 equal pieces, then roll each piece into a ball.
Bake the buns on the center rack until golden, about 20-22 minutes. Transfer the pan to a wire rack placed over a sheet of waxed paper or aluminum foil to cool for about 5 minutes. Now tilt the pan and gently tap it on the counter to release the buns. If needed, you can use a knife to release them from the pan. Place the buns on the wire rack.
In a small bowl, combine the ingredients for the glaze and stir until smooth. If the glaze is too thick, you can thin it out by adding 1 tsp. water at a time. Brush each bun with the glaze. Serve immediately or at room temperature.