Preheat the oven to 350ºF. For best results, line a 8X4 bread pan with an oversized piece of parchment paper. This helps you lift the bread out of the pan to cool, while keeping the streusel topping in place. Otherwise, grease the loaf pan with nonstick cooking spray.
In a large bowl whisk together the flour, 1 cup sugar, baking powder, baking soda, and salt.
In a small bowl whisk together the buttermilk, egg, oil, and vanilla. Stir together cinnamon and remaining ⅓ cup sugar in another small bowl and set aside.
Stir the liquid ingredients into the dry ingredients until just mixed and no flour pockets remain. Layer half the dough on the bottom of the prepared pan. Sprinkle the top with 3 tablespoons cinnamon sugar mixture. Reserve the rest for the streusel topping. Use a knife to swirl the cinnamon into the batter. Top the cinnamon sugar layer with the remaining bread dough.
To make the streusel topping, add the softened butter and 1 tsp. flour to the remaining cinnamon sugar mixture. Use a fork to combine the butter in thoroughly. Sprinkle the crumbles on top of the bread. Use a knife to swirl in gently.
Bake 50-55 minutes, or until a butter knife inserted in the middle comes out without wet dough. Cool in the pan for 10 minutes and then use the parchment paper to lift the bread out onto a cooling rack. Pull down the parchment to allow air to circulate around the bread.
After cooling, mix together the powdered sugar, milk, and vanilla extract for the glaze frosting and drizzle over the top. Allow the glaze to harden slightly before slicing.
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Notes
Cinnamon raisin bread
Stir in 1/2 cup raisins into the bread dough before layering in the pan with the cinnamon sugar mixture.
dairy free adaptation
The recommended GF flour, Cup4Cup, does contain milk powder. For a dairy-free recipe I recommend using King Arthur Measure-for-Measure gluten-free flour.Instead of buttermilk add 1 tablespoon vinegar to a liquid measuring cup. Add enough non-dairy milk, such as almond milk, to reach the 1 cup mark. Stir and let sit for 5-10 minutes. Proceed with recipe as written.For the streusel topping, you have two choices. Either omit the butter and flour and simply sprinkle the remaining cinnamon sugar on top, or substitute solidified coconut oil or vegan butter in the streusel topping.
do I have to use buttermilk?
No, regular milk may be substituted, but you will lose a bit of moisture and tangy flavor. To make a dairy free recipe follow the dairy free adaptation above.
How do I know when the bread is done baking?
Baking with gluten free flour means baked goods take slightly longer to bake. Moisture takes longer to evaporate, so even if it looks done from the outside, it may still be undercooked inside.I like to use something a little larger than a toothpick to check if the bread is done. Use a butter knife or thicker cake tester to make sure the dough isn't sticky inside.
how to store
Gluten free cinnamon bread is best enjoyed within 1-2 days of baking. To store longer, cool the bread completely, slice, and then transfer to an airtight freezer bag up to 3 months.Pull the slices from the freezer as needed, thawing at room temperature or quickly defrost in the microwave.Recipe adapted from Food.com