Optional: mini chocolate chipschocolate sprinkles, chopped nuts
Instructions
Line an 8×8-inch pan with parchment paper, leaving overhang on the sides.
In a saucepan over low heat, combine sweetened condensed milk, butter, and both chocolate chips.
Stir constantly until fully melted, smooth, and glossy.
Remove from heat and stir in brownie mix, vanilla extract, and salt until fully incorporated.
Fold in any optional add-ins if using.
Pour the mixture into the prepared pan and spread evenly.
Refrigerate until fully set, then slice into squares.
Notes
Always heat-treat brownie mix before using.Keep heat low to avoid scorching chocolate.Chill completely before cutting for clean edges.Store refrigerated in an airtight container for up to 7 days