Bloom the Yeast
Warm the milk and combine with sugar and yeast. Let it bubble for 8–10 minutes.
Brown the Butter
Cook butter until golden with nutty aroma. Cool slightly.
Mix the Dough
Add sweet potato, eggs, spices, vanilla, and browned butter to the yeast. Add flour slowly until a soft dough forms.
First Rise
Let the dough rise 1–2 hours until doubled.
Shape
Roll dough and cut donuts + holes. Place on parchment squares.
Second Rise
Let them rise again for 30–40 minutes.
Fry
Heat oil to 350–365°F. Fry donuts 1–2 minutes per side. Drain well.
Glaze
Whisk glaze ingredients. Dip donuts while slightly warm. Let them set—or eat right away.