In a microwave-safe bowl combine chocolate chips and butter. Microwave for 2 minutes and whisk until smooth.
Whisk in powdered sugar until combined.
Add 3 eggs and 1 egg yolk, and whisk until combined.
Add vanilla and flour and mix again.
Generously spray four 1 cup oven-safe cups with cooking spray, and evenly fill with batter.
Bake on a cookie sheet in the oven for 13-15 minutes until the outer edges are set and the center is still soft.
Remove from oven and let cool for 2-3 minutes before inverting onto a plate drizzled with caramel sauce.
Top cake with a scoop of vanilla ice cream and drizzle magic shell topping on top.
Notes
If you don't have oven safe bowls, you can get some Pyrex bowls HERE. You can also use a muffin tin, but instead of making 4, it will make 6 smaller ones.
I would suggest buying Nestle, or Kroger Milk Chocolate Chips. They just tend to melt better in the microwave.
Make sure you spray the bowls well with non-stick spray, so they will come out easier.
Bake on a cookie sheet. This is important just in case it goes over the edge! Then it will be on your cookie sheet instead of burning on the bottom of your oven.
When it is done, don't let it cool for too long! Remember, you want to eat them HOT and Gooey! (well, at least I do!)