Prep Time 25 minutes mins
Cook Time 22 minutes mins
Resting Time 20 minutes mins
Total Time 1 hour hr 7 minutes mins
For best results, avoid overmixing either batter so the cupcakes stay tender and the brownie topping remains fudgy rather than cakey; if your brownie layer seems too thick to spread, loosen it with 1 to 2 tablespoons of milk, and if it browns too quickly in your oven, tent the pan loosely with foil during the last few minutes of baking. Let the cupcakes cool fully so the brownie top can set and slice cleanly when bitten into, and store leftovers in an airtight container at room temperature for up to 2 days or in the refrigerator for up to 4 days, allowing them to come to room temperature before serving.