Here's a recipe for smooth, melt-in-your-mouth ganache made with just milk and no heavy cream. This time, we'll make two types: one using a blend of dark and milk chocolate, and another using only white chocolate. Melt each type of chocolate in a double boiler, add milk and unsalted butter, and mix until smooth. Pour into molds, chill thoroughly in the refrigerator until firm, and cut into bite-sized pieces. Roll any leftover dark chocolate into truffles and coat with cocoa powder. Finish off the white chocolate truffles by coating them with powdered sugar. These are authentic and delicious homemade chocolates, perfect for Valentine's Day.