In a stand mixing bowl, combine flour, yeast and salt, whisk until everything is combined.
In a different bowl mix together, milk, butter, sugar, egg and egg yolks. Whisk until sugar dissolves.
Add dough hook attachment to the mixer and turn it on low speed, slowly add milk mixture to the flour mixture, for about for 2 minute, scrapping down the bowl few times. Next, increase speed to medium-low and knead the dough for 10 minutes. the dough will be sticking to the bottom, but not the sides. Place dough onto floured surface. Knead with hands for 1 minute, to form a round ball. Place the dough into greased bowl, cover and let it rise for 1-2 hours, or until it doubles in size.
Remove the dough from the bowl onto a clean surface. Divide the dough into 16 equal pieces. Roll each piece into a smooth ball, then place each ball seam side down onto a baking sheet lined with parchment paper, 1 ½ inch apart from each other. Cover with plastic wrap and let rise for 1-2 hours, in warm place.
Preheat the oven to 350F and place oven racks to upper-middle and lower-middle positions. Using a ⅓ measuring cup, great the bottom with oil spray, and press it down into the center of each ball, creating a space for filling. Using small ice cream scoop, scoop one scoop of filling into the center of the kolaches.
Brush egg yolk around the kolaches edges and sprinkle streusel over the top, bake for 25 minutes, or until golden brown, rotating baking sheets half way thru baking. Serve warm. Enjoy!
How to Make the Filling
In a stand mixing bowl, add cream cheese and beat using a whisk attachment until smooth, about 1 minute. Scrap down the sides, then add the rest of the ingredients, sugar, egg, lemon juice and vanilla extract, and mix until everything is combined, about 1 minutes.
How to Make Streusel
In a mixing bowl combine flour, sugar and butter, using fingers rub it together until everything is combined.
Notes
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