Preheat oven to 425º F and grease a 10 inch cast iron skillet if needed
Mix eggs and sugar- in a large mixing bowl, whisk together the 6 eggsand 1/3 cup sugar until the eggs are light and fluffy and the sugar is fully combined.
Melt the chocolate- melt the 1 cup butter in the microwave until bubbly, add in the 1 cup chocolate chips and stir to melt the chocolate until it is smooth. Add the cooled butter-chocolate mixture to the egg mixture, don't forget to add the 1 teaspoon vanilla, and whisk to combine.
Mix in the dry ingredients- add in the 2/3 cup all purpose flour and 1/4 teaspoon salt whisk the cake batter until everything is mixed in, there might be a few lumps and that is okay. Do not over mix the cake batter in this step.
Bake- spread the lava cake batter evenly into a greased 10 inch cast iron skillet. Bake in a 425º F oven for 9-11 minutes. The cake is done when a toothpick comes out clean on the edges and with a little chocolate still on it from the center. The cake will be baked on top and still jiggly when the pan is shaken. Do not over bake.
Rest and Serve- allow the cake to rest for 1 minute in the pan before scooping out and serving with a big spoonful of vanilla ice cream.
Notes
Nutrition facts are just an estimate of the ingredients listed