Gooey Chocolate Skillet Cake & Ice Cream

Ingredients:

1 cup flour
1/2 teaspoon baking soda
1 cup sugar
pinch of salt
1/4 cup (1/2 stick) butter
1/4 cup vegetable oil
2 tablespoons cocoa powder
1/2 cup of water
1/4 cup buttermilk
1 egg
1/2 teaspoon of vanilla
Icing:
1/4 cup (1/2 stick) butter
2 tablespoons
3-4 tablespoons milk (as needed for consistency)
1/2 cup chopped pecans
2 cups powdered sugar
1/2 teaspoon of vanilla
ice cream (to serve)
caramel sauce (for serving, this one is delicious!
whip cream (to serve)