1In large bowl,cream the butter,peanut butter and sugars. Beat in egg and vanilla. Combine the flour, baking soda and salt. Gradually add the creamed mixture. Chill for 1 hour.
2Shape into balls. 1-inch each,. Place balls in lightly greased mini-muffin tins. Bake at 325 degrees for 14-16 minutes or until lighty browned. As soon as you take out of oven,using the end of a wooden spoon handle. Make a 3/8-to 1/2 inch deep indentation in the center of each ball. cool in pans for 5 minutes before taking out of pans.then cool completly on wire rack.
in microwave or small saucepan,melt chocolate chips. Stir in the milk and vanilla until smooth. Fill each shell with cohocolate filling. Sprinkle with nuts if you want. If you have chocolate filling left you can keep it and warm up and serve over ice cream.