Add the butter, 2 ounces of chocolate chips, and the unsweetened chocolate to a glass bowl and microwave for 30 seconds. Remove and stir. Repeat in 10 seconds increments until the chocolate is melted and combined with the butter. DO NOT OVERCOOK!
Add the eggs, vanilla and sugar to a large bowl and stir (don’t whisk!) Stir the chocolate mixture into the egg mixture and set aside until it reaches room temperature.
In a medium bowl, sift together 1/4 cup of flour, baking powder, salt and nutmeg. Add it to the chocolate mixture.
Toss 1/2 cup of chocolate chips and one tablespoon of flour and add them to the chocolate mixture.
Pour the mixture into a 6.5″ cast iron skillet. Place the skillet on a baking sheet and bake for 23-25 minutes. You want them slightly underdone as it will firm up while sitting for a few minutes.
Top with vanilla ice cream, toffee bits, caramel and chocolate and enjoy immediately!