1 stick butter, softened (or 1/2 c. butter)
2. Cream the butter and sugar with a mixer. Add eggs and mix well.
3. Dissolve baking soda in the sour cream. Let it "rise" for a minute, then add it to the butter and egg mixture. Mix well with beater on medium speed. Add bananas and blend in.
4. Add flour and baking powder together. Mix in thoroughly, but no longer than necessary. Add vanilla. Stir in chocolate chips by hand. Fill muffin cups. Bake for 20 minutes. Recipe makes approximately 1 1/2 dozen.