Quick & Easy Microwave Fudge

12 oz. semi-sweet chocolate
1 can sweetened condensed milk
1 cup pecans, chopped
2 Tbsp. vanilla
1 unsweetened baking chocolate square
1 cup marshmallows

Combine semi-sweet chocolate, chocolate square and condensed milk. Microwave on high for 2 minutes. Stir until well mixed. Add nuts, marshmallows and vanilla. Stir until smooth. Grease pan and pour fudge into pan & refrigerate.