Here is a goal: How long to bake your Nutella brownie?

Which way makes more sense to accomplish this goal?

pick from the following.
i. Preheat the oven to 350 degrees. Bake for about 10 minutes. Stick a toothpick in the center and bake until the toothpick comes up clean.;
ii. Preheat the oven to 350 degrees. Bake for about 20 minutes. Stick a toothpick in the center and bake until the toothpick comes up clean.;
ii.