Quick and Easy Chocolate Cake

4 ounces unsweetened chocolate, in pieces
1/2 stick butter
2 1/3 cups flour
1 2/3 cups boiling water
2 cups sugar
1/2 cup heavy cream
2 eggs
2 teaspoons baking soda
1 teaspoon salt
1 teaspoon vanilla

Heat oven to 350. Grease and flour 13 x 9-inch pan. In large bowl, combine chocolate, butter and water, stir until chocolate is melted and smooth. Add flour, sugar, cream, eggs, baking soda, salt and vanilla, beat on low until smooth. Pour into pan. Bake 35 to 40 minutes or until center tests clean. Cool completely in pan on wire rack.