Heat oven to 350°F (177°C). Lightly butter a 10-ounce ramekin with ¼ tablespoon butter. Set aside.
Place 2 tablespoons of butter in a small microwave safe bowl. Heat in microwave until just melted. Set aside.
Whisk together the sugar, flour, and cocoa powder in a small bowl until thoroughly combined.
Add the melted butter, egg yolk, and vanilla. Stir with a spoon or a rubber spatula to combine. Do not overmix.
Fold in the chocolate chips.
Pour the batter into the prepared ramekin. Spread into an even layer. Bake for 30 minutes.
Remove from the oven and let cool for 5 minutes before enjoying. Top with ice cream, if desired.
Notes
Choose Premium Chocolate: For the best results in your single serve brownie, opt for high-quality chocolate chips. Brands such as Ghirardelli, Guittard, and Scharffen Berger are top picks. For budget-friendly options, Trader Joe's and Whole Foods' 365 brand also deliver great flavor and quality.
Avoid Overbaking: Stick closely to the recommended 30-minute bake time to ensure a moist, fudgy deep dish brownie. Keep in mind that your single brownie will continue to firm up as it cools, so there's no need to extend the baking time in pursuit of a firmer texture.