Step 1

Check the yeast: (see footnotes if you'd like to make this dough in the breadmaker)Dissolve 2 tsp of yeast with 1/2 cup milk and 1 tsp of sugar from the overall amount and leave in a warm location until frothy, about 10-15 minutes. If the mixture does not froth up and rise, discard the yeast and start over when you have a fresh batch of dried yeast.

Step 2

Combine all ingredients:Into a bowl of a mixer, sift 3 cups of flour. Then add 1/3 cup sugar, remaining 1/2 cup warm milk, 4 egg yolks, 2 tbsp sour cream, 1 tbsp vanilla extract, and the risen yeast mixture. By hand, using a spoon or the hook of the mixer, quickly mix the ingredients until a rough, shaggy mixture forms.

Step 3

Knead: Attach the hook back to the mixer and knead on low speed (speed 2 to 3 on a Kitchenaid mixer) for about 20 minutes or until the dough stops sticking to the side of the bowl, feels elastic, and is tacky to touch. If the dough is adequately kneaded, a small piece can be stretched into a see-through "window" without tearing.Pro tip: Do not over-knead past a point where the dough is elastic and stretchy. If the gluten is overworked, it will tear, leaving you with a chunky dough that doesn't have the strength to hold a good rise of the dough.

Step 4

Add 3 oz of butter and 1/4 tsp of the salt and knead it into the bread until no streaks of butter are seen (~5-7 minutes). Sometimes tearing the dough into chunks helps to incorporate the butter easier/faster.

Step 5

1st Rise: Oil the sides of the bowl and the dough. Cover the bowl with a kitchen towel and leave in a warm place to rise until doubled in size, about 1.5 hours. Boil a cup of water in a microwave for several minutes. Remove the cup with water. Place the bowl with the dough in the warm microwave for the dough to rise. This gives the dough a nice warm place without being too hot.

Step 6

Shape: This recipe makes one large braid. To make two smaller sweet yeast bread loaves divide the dough into two, then shape two separate braids instead of one like the recipe instructs.Once risen, divide the dough into 3 equal pieces. Weighing the dough is the best way to divide the dough evenly. Next, roll each piece into a tight ball, then into a 20-inch log. If the dough is hard to stretch or it springs back too much, cover it with a tea towel and leave for 10-15 minutes. This will relax the gluten and make it easy to roll.Pinch the ends of the 3 strands together at one end, then braid them into a braid pinching the ends together. Now, tuck both ends of the braid underneath itself slightly to give it a better shape.

Step 7

2nd Rise: Transfer the sweet yeast braids to a 12"x18" baking sheet pan. Space them evenly. Cover with a clean tea towel. Transfer to a warm place once again until the braid doubles in size or a light pressing of the finger doesn't make the dough spring back quickly, but instead slowly springs back while still leaving slight indent.

Step 8

Prep before baking: Once doubled in size preheat the oven to 350F with the baking rack centered. Brush the braid with a whisked egg yolk and water and sprinkle with sesame seeds or poppy seeds if you wish. Applying the egg yolk mixture several times will give you a darker glaze once baked.

Step 9

Bake the braid for about 30-35 minutes or until the top is golden brown. You can also check for doneness with a thermometer. The center of the thickest part should register 195°F. If the top starts to brown before the inside registers 195F, loosely tent the sweet yeast bread with foil.Once baked, remove from the oven to a cooling rack and cool completely before cutting or eating.