Step 1

Preheat oven to 325° F.Line two 12-cup muffin pans with liners.

Step 2

Melt chocolate and butter in double boilerstirring occasionally. Beat sugar and eggs in large mixer bowl on high for about 3 minutes or until mixture falls from beaters in ribbons.With mixer at medium speedadd melted chocolate mixture to egg mixture.Gradually add flour.Stir in nuts.Scoop 1/3 cup batter into each cupcake linerfilling 3/4 full.

Step 3

Bake for 25 to 30 minutes or until toothpick inserted in centers comes out with loose crumbs attached.Cool in pans for 5 minutes; remove to wire racks to cool completely.