Activate Yeast. Mix yeast and sugar in a teaspoon or two of milk. Leave aside for 10-15 minutes or until it starts to bubble.
Knead the Dough. In a large mixing bowl, combine flour, 2 eggs, salt, oil, and the yeast mix. Start adding warm milk as you mix the flour, and mix until it becomes doughy. Take over with your hand, and knead until you get one smooth, elastic dough ball.
Let the Dough Rise. Cover the bowl with a kitchen towel and set aside in a warm place for about 45-60 minutes or until the dough doubles in size.
Work the Dough. Dust your working space. Take the dough ball out and divide it in half. Take one half and work it with your hands for another few minutes.
Fill Buhtle. Using a rolling pin, spread it out into a rectangle. Cut 15-16 squares. Place one teaspoon of jam in the middle of each square,
Form Buhtle. and close it up, making a small ball. The easiest way to do it is to pinch opposite corners of the square, and do that for all four sides, twice. Alternatively, you can roll the square into a ball.
Proof Last Time. Place each roll into an oiled pan, keeping the pinched side down, starting on the sides of the pan towards the middle until you fill the pan. Rest rolls for 30-45 minutes. Heat oven to 390°F (200°C) the last 15 minutes.
Add Egg Wash. Mix the remaining egg yolk and 1 teaspoon oil and paint each roll. Top with a tiny slice of butter.
Bake. Bake for 15 minutes, then turn the pan around 90°. Bake another 10-20 minutes. (Be mindful - in the last few minutes the rolls may start to blush faster due to the egg and butter on top. If they do, cover them with foil.)
(Optional) Sprinkle with powdered sugar.
Serve warm with a hot cup of tea, Bosnian coffee, and/or an additional side of preserves. Store in an airtight container or bag at room temperature, for up to two days.Reheat buhtle in the oven for a few minutes to restore softness.