Step 1: Heat oven to 375 degrees F. Melt chocolate chips and butter in a small saucepan. Set aside to cool for 10 minutes.
Step 2: In a separate bowl, whisk eggs and sugar together.
Step 3: Add vanilla and flour. Whisk until flour is well mixed in.
Step 4: Once the chocolate has cooled, combine it with the egg mixture.
Step 5: Fill 4 (7-ounce) ramekins about three-fourths full with chocolate batter. Bake for 14 minutes.
Step 6: Check to make sure the edges of the ramekin are cooked and the top of the cakes appear to be cooked as well.
Step 7: Once cooled, sprinkle the cakes lightly with powdered sugar.
Step 8: Serve with ice cream or whipped cream.