Cream butter or margarine, sugar and eggs in small bowl until fluffy. Add sour cream and vanilla. Beat well. Combine flour, cocoa, baking soda, and salt. Blend into creamed mixture. Stir in chocolate chips. Spread evenly in greased 9 inch baking pan. Bake at 350 for 30 to 35 minutes or until toothpick inserted in center comes out clean.
This is an amazing recipe. The brownies come out so moist and they just melt in your mouth. But I usually double the recipe and place it in a nine by thirteen pan. It takes a little longer to bake but you end up with thick and moist brownies. This is one of my favorites. I have never made it and had anyone say yeah they are okay. I love to see the response I get from others when they try these brownies for the first time. It always feels good to bring joy to someone with something so simple. Hope you enjoy them too.