Some of the things that you need to add are 1/2 cup mini chocolate chips, eggs lightly beaten, at room temperature, 1 teaspoon kosher salt and 2 tablespoons unsalted butter, melted. You can get the recipe at http://allrecipes.com/recipe/satiny-chocolate-glaze/.
All you need is butter and chocolate. The ratio is 1/4 cup of butter for every 1 cup chocolate. (P.S. I wouldn't use chocolate chips, they have a synthetic stabilizer that keeps them in their chip form when melted. Note: chocolate chip cookies.)