Microwave 1 cup chocolate morsels in a 2-cup glass measuring cup at HIGH 1 minute, stirring after 30 seconds. Stir until smooth. Cool slightly.
Beat cake mix and next 3 ingredients at low speed with an electric mixer until moistened. Increase speed to medium, and beat 1 to 2 minutes or until well blended and smooth. Add melted chocolate and vanilla, beating until blended. Spoon batter by 1/4-cupfuls into paper baking cups in muffin pans.
Bake at 375° for 16 to 18 minutes or until a wooden pick inserted in center comes out clean. Let cool in pans on wire racks 5 minutes. Remove from pans, and cool completely on wire racks. Spread Orange Buttercream Frosting evenly over cupcakes.
Place remaining chocolate morsels in a 1-qt. zip-top plastic freezer bag; seal bag. Microwave at MEDIUM (50% power) 45 seconds to 1 minute, turning bag over after 30 seconds. Squeeze chocolate in bag until smooth. Cut a tiny hole in 1 corner of bag. Pipe melted chocolate over Orange Buttercream Frosting on cupcakes by gently squeezing bag.
Love these cupcakes! The orange flavor is very nice and the cupcakes turned out great! I made the orange buttercream frosting but didn't drizzle additional chocolate on top...they were already rich enough without it. Will definitely make again because it is quick and delivers a great result.
Everyone loved these cupcakes. they were very moist and delicious. i didnt make them with the orange buttercream icing but they were still great. i plan to use the recipe for an actual cake next time. the chocolate drizzle was an excellent addition.
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