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Mix the Liquids
In a large bowl, combine: warm milk, yogurt, sugar, instant yeast. Stir gently.
Add: egg whites, oil, butter. Mix until smooth.
Add the Flour
Add: flour and salt. Mix until combined.
Gradually add remaining flour until dough becomes: soft, smooth, slightly tacky, not wet, not stiff.
Knead for 8-10 minutes, until elastic and smooth.
First Rise
Cover with plastic wrap or a kitchen towel.
Let rise for 60-75 minutes, until puffy and nearly doubled.
Shape
Line a baking tray with parchment paper.
Divide the dough and shape as desired: filled buns, plain rolls, sandwich-style buns.
Place shaped dough on the prepared tray.
Bake
Brush with reserved egg yolks. Sprinkle with sesame or nigella seeds, if desired.
Bake at 375°F (190°C) for 20-22 minutes, until golden. Bon appétit.