Generously grease a standard 9"x13" baking pan and set aside.

In the bowl of a stand mixer or in a large bowl if mixing by hand, mix the yeast, 2 Tablespoons of the brown sugar and the warm water and allow it to sit undisturbed until foamy, about 5 minutes.

Add in the egg, remaining brown sugar and 1 cup of the flour. Mix with a spatula or wooden spoon. Sprinkle the remaining 2 cups of flour on top of the batter but do not mix it. Cover with a wet towel and place in a warm spot for about 60-90 minutes.

Add in the Greek yogurt, orange zest and juice, baking powder and salt and mix slightly with your spatula or wooden spoon. Using the dough hook attachment, knead the dough on medium speed until the dough is smooth but slightly sticky, about 2-3 minutes. You can also knead by hand. Add in the butter in 2 additions and mix on medium speed until the dough becomes smooth and shiny, about 4 minutes. It will be slightly sticky at this point.

Transfer the dough to your prepared baking pan and pat it down. Spread it out into the pan, making sure to cover all the corners. Cover and allow to sit in a warm spot for 60-70 minutes.

Fan the thin apple slices across the dough in whatever pattern you like. Sprinkle the streusel on top of the cake and bake in your preheated oven for about 35-45 minutes or until a toothpick inserted in the center comes out clean. Remove the cake from the oven and allow to cool.

While the cake is cooling, make the glaze. Mix the powdered sugar and orange juice together until you achieve a glaze consistency. If it is too watery, add more powdered sugar. If it is too thick, add more orange juice. Drizzle the glaze on top of the cake.