Cinnamon Crumble Coffee Cake

0 Preheat oven to 350 degrees F. Spray bundt pan with nonstick cooking spray and set aside.
1 Make flax egg by combining ground flaxseed with warm water. Stir and set aside for 5 minutes to gel up. Make the vegan buttermilk by combining the non-dairy milk with the apple cider vinegar. Whisk and set aside to curdle for 10 minutes.
2 In a large mixing bowl, whisk oil, sugar, and eggs together. Whisk in the milk mixture.
3 In a separate bowl, add flours, baking powder, salt, cinnamon, and nutmeg and whisk to fully combine. Then slowly add dry ingredients to the wet ingredients. With a wooden spoon, gently fold and stir until well combined. Make sure not to over mix it.
4 In a small bowl, combine the brown sugar, walnuts, cinnamon, and nutmeg.
5 Layer into the bundt pan as follows: 1/2 batter, 1/2 streusel, 1/2 batter, and top with the remaining streusel.
6 Bake for 50-60 minutes or until a toothpick inserted comes out clean. Allow to cool on a wire rack for 10 minutes. Turn over onto a plate and serve warm.
7 Enjoy!
8 Wrap leftovers in plastic wrap or store in a big ziploc bag so it can stay moist. When you want to eat it again, cut a slice, and warm it up in the microwave for 20 seconds.
9 (Adapted from The Sweet Tooth Life)