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For a deeper chocolate flavor, you can choose a devil’s food or extra dark chocolate cake mix instead of standard chocolate fudge. If your family likes a little texture, fold in a small handful of chopped nuts or mini chocolate chips along with the eggs and butter, keeping in mind that this technically adds more ingredients beyond the core four. To make them a touch less sweet, dust the top lightly with unsweetened cocoa powder after the frosting sets. If you need to stretch the pan for a crowd, cut the brownies into smaller bite-size squares and serve on a platter lined with fresh parchment or foil. For a slightly thicker brownie, use a 9×9-inch pan and add 3–5 minutes to the baking time, checking carefully so they stay fudgy. If you’re baking in a glass pan instead of metal, reduce the oven temperature to 325°F and start checking a few minutes later, as glass holds heat differently. Food safety tips: Always bake until the eggs are fully cooked; a toothpick should come out with moist crumbs, not raw batter. Let the melted butter cool slightly so it doesn’t start cooking the eggs when you mix everything together. Store leftovers tightly covered at room temperature for up to 2 days, or refrigerate if your kitchen is very warm; bring chilled brownies back to room temperature before serving so the texture softens. When serving to young children or older adults, avoid leaving the brownies out for more than 2 hours at room temperature, especially in hot weather, to keep them fresh and safe.
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