I've done this on cookies before, not cakes, but I'm sure the concept is similar. To make the chocolate "flow" better, I add a tiny bit of shortening to it when melting. Just a teaspoon or so seems to work.
That WILL be good! I have a chocolate cookie that I add chopped marischino cherries and drizzle melted white chocolate and call them "Chocolate Covered Cherry Cookies". How are you doing the drizzle? I put mine in a disposable pastry bag, snip the end off and drizzle away!
I agree that you may need to add a small amount of either Crisco or butter. Because white chocolate has no cocoa butter, it has less fat and doesn't seem to melt as "thinly" as milk or dark chocolate.
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