Rising, sprinkling, and figuring eighting

When someone says that a recipe is the best thing they've put in their mouth all year, I feel like that's an invitation to make it. Also when I said I was making Babka, Andy kept calling it luffa ... "How's the luffa?" Hrm... this is not luffa... but I will tell you that this turned out... amazing... no really... amazing.
This recipe has a lot of steps, a lot of rising and well worth the effort and the time. I promise.
A few weeks ago we went apple picking and we came home with two giant bags of apples, they seemed giant. One for eating and one for baking. I'm happy to report that we've actually eaten or baked with almost all of them! I'm proud of us. This Babka recipe used a few of them and they were well placed.
This recipe is some work. There is dough to make, let rise for a long time, roll out, filling, topping, figuring eighting. I was thinking I might try to and buck the system and let it rise over night in the over and bake it Sunday morning, oh man I'm glad I didn't do that! I was somewhat worried when I put it in the oven to bake thinking it hadn't risen enough the last time, but wow it puffed in the oven. You have to let it cool all the way before cutting into otherwise it will all fall apart. We waited, impatiently on my part, until Sunday morning to cut into it. Oh wow, the beautiful swirls of yumminess and the crunchy topping. We all agreed it was wonderful and I am willing to say it was well worth all the efforts. It also made the house smell amazing. Well, that and the crock pots of apple butter bubbling on the counter.

Apple Cinnamon Babka
Ingredients
2/3 cup whole milk, warmed to about 110°F (43°C)
2 and 1/4 teaspoons Platinum Yeast by Red Star (1 standard packet)
1/3 cup granulated sugar, divided
5 Tablespoons unsalted butter, sliced into 1 Tbsp size pieces and softened to room temperature
2 large egg yolks (reserve 2 egg whites for filling and topping)
1 teaspoon salt
2 and 2/3 cups all-purpose flour (spoon & leveled), plus more as needed and extra for work surface and hands

Filling
3 Tablespoons unsalted butter, divided
2 large apples, peeled and thinly sliced into bite-size pieces (2–2.5 cups)
1 teaspoon lemon juice
1 cup packed light or dark brown sugar (or a mix of both)
1/4 cup all-purpose flour
2 and 1/2 teaspoons ground cinnamon
1/4 teaspoon salt
1 and 1/2 teaspoons pure vanilla extract
1 large egg white (reserved from dough)

Crumble Topping
2 Tablespoons packed light or dark brown sugar
2 Tablespoons all-purpose flour
1/4 teaspoon ground cinnamon
2 Tablespoons unsalted butter, cold and cubed

Brush on Assembled Loaf
1 egg white (reserved from dough)

Instructions
Prepare the dough: Whisk the warm milk, yeast, and 1 Tablespoon of sugar together in the bowl of your stand mixer fitted with a dough hook or paddle attachment. Cover and allow to sit for 5 minutes. 
Add the remaining sugar, the butter, egg yolks, salt, and 1 cup (125g) flour. Beat on low speed for 30 seconds, scrape down the sides of the bowl with a rubber spatula, then add another cup of flour. Beat on medium speed until relatively incorporated (there may still be chunks of butter). Scrape down the sides of the bowl with a rubber spatula. Add 1/2 cup of flour and beat on medium speed until the dough begins to come together. As the mixer runs, add another 2-4 Tablespoons of flour depending on how wet the dough looks. (I usually add another 2 Tbsp, which makes it about 2 and 2/3 cups of flour total.) This should be a very soft and almost creamy-feeling dough. Do not add more flour than you need.
Knead the dough: Keep the dough in the mixer and beat for an additional 3 minutes or knead by hand on a lightly floured work surface for 3 minutes. Add additional flour as you knead it, as needed to prevent it from sticking to the work surface. The dough is very buttery and soft. (See video tutorial above if you need a visual of kneading dough by hand.)
1st Rise: Lightly grease a large bowl with nonstick spray. Place the dough in the bowl, turning it to coat all sides. Cover the bowl with aluminum foil, plastic wrap, or a clean kitchen towel. Allow the dough to rise in a relatively warm environment for 3-4 hours or until nearly double in size. This dough is rich with fat, so it takes longer than other doughs to rise. (If desired, use my warm oven trick for rising. See my answer to Where Should Dough Rise? in my Baking with Yeast Guide.)
Towards the end of rise time, you can prepare the filling: Melt 1 Tablespoon of butter in a large skillet on the stove over medium heat. Add the apples. Stir and cook until the apples are slightly softened, about 3 minutes. Remove from heat and stir in lemon juice to help prevent browning. Set aside. For the rest of the filling in this step, make sure you don’t prepare it too far in advance because the butter will solidify and spreading onto the dough will be difficult. Melt remaining 2 Tablespoons of butter in a medium heatproof bowl in the microwave (or use the stove). Stir in brown sugar, flour, cinnamon, salt, and vanilla extract until crumbly and combined. Stir in the egg white. Set aside.
Grease a 9×5 inch loaf pan.
Shape the dough: When the dough is ready, punch it down to release the air. Flour a work surface, your hands, and a rolling pin. Roll the dough out into a 12×16 inch rectangle. Carefully and slowly spread the cinnamon filling mixture on top. (The dough is quite soft underneath and you don’t want to tear it.) Add the apples in a single layer. Using floured hands, tightly roll up the dough to form a 16-inch long log. If any parts of the dough feel soft as you roll it up, add a sprinkle of flour as I do in the video above. Place the log on its seam. Fold in half, then twist it to form a figure 8. Pinch the ends together. Use the video tutorial and photos above as a visual. Place in prepared loaf pan.
2nd Rise: Cover shaped babka with aluminum foil, plastic wrap, or a clean kitchen towel. Allow to rise until it’s puffy and nearly reaches the top of the loaf pan, about 1-1.5 hours.
Towards the end of rise time, you can prepare the crumble topping: Mix the brown sugar, flour, and cinnamon together. Add the cold butter and using a pastry cutter or a fork, cut butter into the brown sugar mixture until pea-size crumbles form. Refrigerate until ready to use.
Preheat oven to 350°F (177°C). Place a baking sheet on a lower oven rack to catch any juices or crumbles that may drip/drop down. (Has only happened to me once!)
Carefully brush the surface of the babka with last remaining egg white. Using a toothpick, poke 10-12 holes all over the top of the loaf. This allows steam to escape from inside the loaf so the layers don’t separate. Sprinkle with crumble topping.
Bake: Bake for 60-65 minutes or until golden brown on top. If you gently tap on the loaf, it should sound hollow. If you notice the top browning too quickly, loosely tent the pan with aluminum foil. (I usually add aluminum foil over the loaf around the 25 minute mark.) Remove from the oven and allow bread to cool in the pan for at least 30 minutes before slicing and serving. For neat slices as pictured above, I recommend cooling completely before slicing. A serrated knife is best for slicing.
Cover leftover babka tightly and store at room temperature for 2 days or in the refrigerator for up to 1 week.