Step 1: In a small bowl, combine warm water, yeast, and a pinch of sugar. Let sit for 5-10 minutes until foamy.
Step 2: In a large mixing bowl or stand mixer with dough hook, combine flour, sugar, and salt. Add yeast mixture and eggs. Mix on low until combined.
Step 3: With mixer on low, add softened butter one cube at a time, mixing until fully incorporated after each addition.
Step 4: Knead dough on medium speed for 8-10 minutes until smooth, elastic, and slightly sticky. It should pull away from the bowl sides.
Step 5: Place dough in a lightly greased bowl, cover with plastic wrap, and let rise in a warm place for 1-2 hours until doubled in size.
Step 6: Punch down dough and divide into 8 equal pieces (about 4 oz each). Shape each into a smooth ball.
Step 7: Place balls on a parchment-lined baking sheet, spacing 2 inches apart. Cover loosely and let rise for 45-60 minutes until puffy.
Step 8: Preheat oven to 375°F. Whisk egg yolk with milk or cream and gently brush over buns.
Step 9: Bake for 15-18 minutes until golden brown. Transfer to a wire rack to cool completely.