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1
Line a large baking sheet with parchment paper.
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2
In a mixer bowl, hand-whisk water and yeast together and let stand 2 to 3 minutes to dissolve yeast. Briskly whisk in vanilla, sugar, eggs, softened butter, and salt and blend well. Add 3 to 4 cups bread flour and mix. Then knead with dough hook on lowest speed of mixer 6 to 8 minutes, adding more bread flour as necessary to form a soft, bouncy dough. (If you don't have a stand mixer simply add flour until the dough is too stiff to stir by hand, then turn out onto a lightly floured surface and knead for about 8 minutes, adding flour as needed to prevent sticking. Your dough is ready when it's smooth, soft and bounces back when you press your thumb into it.).
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3
Remove dough hook and spray dough with nonstick cooking spray. Cover entire mixer and bowl with a large clear plastic bag (I used saran wrap to very loosely cover the bowl). Let dough rise 30 to 60 minutes or until almost doubled.
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4
Turn out dough onto a lightly floured work surface and gently deflate. Cut dough into 12 equal portions. Shape each into a small round roll or bun. Place about 3 inches apart on prepared baking sheet. Whisk 2 eggs and a pinch of sugar together in a small bowl. Brush each bun well with egg wash.
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5
Preheat oven to 350 degrees F.
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6
For butter crumb topping, in a small bowl, rub ingredients together to form a crumbly mixture. Distribute carefully on top of each bun. Cover buns loosely with plastic wrap and let rise about 30 to 45 minutes or until quite puffy and almost doubled.
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7
Bake for 28 to 35 minutes or until browned all over.