Admittedly, this version of the 3 Musketeers isn't quite as fluffy as the original, but it does have the mild chocolate flavor your remember. Use milk chocolate for a classic 3 Musketeers bar, or dark chocolate for a "Midnight" edition.
Click here for this recipe: http://www.seriouseats.com/recipes/2011/10/homemade-3-musketeers-bars-candy-halloween-recipe.html