Step 1

Sift cake flour, baking powder, salt, and nutmeg into a bowl and set aside.

Step 2

Mix butter and sugar together. Add egg and sour cream. Mix again.

Step 3

Alternately add flour mixture and buttermilk until soft dough forms.

Step 4

Place dough on floured surface and knead 2-3 times to cover dough with flour.

Step 5

Roll out to an 8 X 12-inch rectangle. Cut into 12 pieces that are 2 X 4-inches using a pizza cutter. Lightly score top of donuts.

Step 6

Add 4 cups oil to deep pot and heat to 370°. Whisk together glaze while oil is heating up.

Step 7

Carefully drop a few donuts into hot oil and fry on both sides, turning once, until golden brown.

Step 8

Remove with a slotted spoon or spider strainer and place on a tray lined with paper towels.

Step 9

Let oil come back up to temperature and repeat with remaining dough.

Step 10

Once donuts are slightly cooled, dip each one in glaze and place on a wire rack over a tray to dry. Serve immediately.