To prepare a valentines day unicorn bark recipe, first you need to gather your ingredients. First, you'll need: 12 cup (120 milliliters) confectioners' sugar, 1 tablespoon (2.5 grams) cocoa powder, and 1 teaspoon (0.5 grams of) vanilla extract. You can find these ingredients at your local grocery store, or you can buy them online. If you don't want to buy the ingredients online, just cut them out of the box and put them in the microwave for 30 seconds. Then, pour the melted chocolate into the bowl and stir it until it's evenly coated with the chocolate. Next, add the dry ingredients to the wet ingredients and mix them together until they're well combined. Pour the mixture into your prepared baking pan and bake it for 20 minutes or until the top is golden brown. Remove the pan from the oven and let it cool for 10 minutes before cutting it into squares.