Preheat oven to 350°F. In a medium cast iron skillet, heat the butter and heavy cream over medium-low heat until just simmering.
Add the chocolate chips to the melted butter mixture, stirring constantly until smooth and fully melted. Remove from heat and let cool for 5 minutes.
In a large bowl, whisk together the sugar and eggs until smooth.
Add the chocolate mixture to the sugar mixture and stir until well combined.
In a separate bowl, combine the flour, cocoa powder, and salt. Gradually stir the dry ingredients into the wet ingredients until a thick, smooth batter forms with no lumps.
Use a rubber spatula to spread the batter evenly into the cast iron skillet. Sprinkle additional chocolate chips evenly over the top.
Bake for 25-30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
Serve warm with a scoop of vanilla ice cream or enjoy at room temperature.
Notes
Use room temperature eggs for a smoother batter and better texture.
Don’t overmix the batter to keep the brownies soft and fudgy.
Grease your cast iron skillet well to prevent sticking.
For best results, avoid overbaking, brownies should be slightly fudgy in the center.
Store leftover brownies in an airtight container at room temperature for up to 4 days or freeze for up to 3 months.