Chocolate Chocolate Chip Muffins

From AllRecipes.com, submitted by Laura.

Prep: 25 min. Cook: 25 min.
Yield: About 18 muffins

6 (1-ounce) squares semisweet chocolate
1/3 cup unsalted butter
¾ cup milk
½ white sugar
2 eggs
1 ½ teaspoons vanilla
1 2/3 cups all-purpose flour
1 teaspoon baking soda
½ teaspoon salt
1 cup semi-sweet chocolate chips
½ cup sour cream

In a small saucepan over low heat, melt the chocolate squares together with the butter. Let stand until cooled, about 10 minutes.

Lightly beat the egg. In a small bowl, stir together the chocolate-butter mixture with the milk, sugar, egg, vanilla, and sour cream until blended well.

In a large bowl, stir together flour, baking soda, and salt. Add chocolate mixture to dry ingredients and stir until just combined. Stir in the chocolate chips. Spoon the batter into muffin pan lined with cups.

Bake at 400˚F for 20-25 minutes or until a toothpick inserted in the center of a muffin comes out clean. Let muffins cool at least five minutes before removing from muffin pan.

Notes:
- Substitution for chocolate squares: 6 Tbs. cocoa powder + ¼ cup butter + 7 Tbs. sugar