4 ounces unsweetened chocolate, chopped
1/2 cup unsalted butter, cut into pieces
1 1/4 cup granulated white sugar
1 teaspoon pure vanilla extract
3 large eggs
3/4 cup all purpose flour
1/4 teaspoon salt

Preheat oven to 325 degrees F and place rack in center of oven. 

Melt the chopped chocolate and butter in a stainless steel bowl placed over a saucepan of 
simmering water. Once the chocolate is melted and smooth, remove from heat and let cool for 
a few minutes. Then stir (can also use a hand mixer) in the sugar. Add the vanilla and then 
add the eggs, one at a time, mixing well after each addition. Mix in the flour and salt until 
well blended. 

Evenly divide the batter between the muffin cups. Place in the preheated oven and bake for 
about 20 - 25 minutes or until a toothpick inserted in the center of a cupcake has moist crumbs. 
Remove from oven and let cool on a wire rack.