• Preheat oven to 350℉, grease bread 9x5x3 inch loaf pan.

Cinnamon Streusel

• Add flour, brown sugar, and cinnamon to a food processor. Give ingredients a couple of pulses. Cut up cold butter into small cubes, add to the food processor, and pulse until the streusel is uniform and doesn't have any large clumps. Set aside.

Quick Bread

• In a large bowl whisk together softened butter and sugar until light and fluffy.
• Measure out buttermilk in a large measuring cup, add Greek yogurt, and eggs, whisk to combine. Add vanilla extract. Add to the butter sugar mixture, and blend until smooth.
• Add the flour, baking powder, baking soda, nutmeg, and salt to the wet ingredients. Whisk to combine, then mix until the batter is smooth and free of lumps.
• Pour half of the batter into the pan, sprinkle with half of the cinnamon streusel. Pour the remaining batter over the streusel. Take a knife and run it through the batter in a S pattern to swirl in the cinnamon streusel. Pour the remaining streusel over the top and press it down to form a smooth layer on top of the bread.
• Place in preheated oven. Bake for 50 minutes. Poke with a toothpick; if it comes out clean, remove from the oven and allow to cool before removing from the pan. If not, cover the pan loosely with aluminum foil and bake until a toothpick inserted into the center comes out clean. (another 15-20 minutes) Aluminum foil is used to prevent the sugar on top of the bread from burning.