Pour ½ cup of warm milk, ½ cup of heavy whipping cream, and ¼ cup of sugar into the Bosch mixer. (Warm up the milk in the microwave for 15 seconds or leave it out at room temperature for 30 minutes before using it. Also, I used 2 % milk. You can use fat free or whole milk.)
After that, add 1 tablespoon of active dry yeast and 1 large egg into the Bosch mixer. ( I prefer to use a Bosch mixer.)
Turn on the lowest setting #1 and let it mix it a little bit and turn off the mixer. Then, wait for 5 minutes. (Don't run the mixer too long, just want to mix the ingredients.)
In another container, put 1&½ cups of bread flour, ½ cup of cake, ½ tablespoon dough enhancer, ½ tablespoon of vital wheat gluten and 1 teaspoon of salt. Mix it well.
After, turn on the mixer at the lowest setting #1 and pour the flour mixture slowly into the yeast mixture. (Note: if the dough is sticky, add the rest of ¼ cup bread flour at a time until the dough comes together). Then, change the mixer from lowest setting to medium or high setting #3 and let it run for 10-15 minutes.
After 10-15 minutes, the dough is ready. Then, take the dough out in a bowl and cover the bowl with a damp towel and let it sit for 45 minutes. (My trick to speed up the rising time. Normally, I preheat the oven to 200F. Then, turn off the oven and put the dough in for 30 minutes.)
In the meanwhile, prepare the topping dough. Put ¼ cup of nonfat dry milk powder into the chopper.
Then, add ¾ cup of sugar into the chopper. Let it run for a few seconds until it's smooth and fine.
In a container, put 1 & ¼ cups of all purpose flour, the chopped sugar and dry milk powder from step 7 and 8. Also, 1 large egg yolk, ½ teaspoon of baking soda, ¼ teaspoon of baking powder, ¼ cup of melted butter, ½ teaspoon of vanilla extract and 4 tablespoons of milk.
Mix the ingredients well and keep kneading until the dough comes together. Set it aside and cover with a cloth.
When the dough rises, roughly divide the dough into 12 or 10 pieces depending how big the bun or bread you want. (I did it for 12 pieces.)
Next, roll the dough into balls and put on the parchment paper with oil spray on the tray. Cover it with a wet cloth and let it wait for 15 minutes.
At the same time, roughly divide the topping dough from step 10 and roll it into a ball.
Take a topping dough and cover with plastic wrapper.
Press with your palm to flatten the topping dough.
The following step, put the topping dough on top of the bread dough from step 12.
Beat a large egg yolk or egg and brush the egg on top of the topping dough.
Preheat the oven at 350F, bake at 350F for 18-22 minutes until it's golden brown.