These 3-ingredient chocolate chip blondies are exactly the kind of “miracle” my friend’s Nana Helen swore by—a pan disappears before anyone even sits down to dinner. They start with a humble box of yellow cake mix, a stick of butter, and a generous handful of chocolate chips. No eggs, no fuss, just a quick stir, into a glass casserole dish, and a short bake until the top is lightly browned and the center stays soft and gooey.
Freshly baked chocolate chip blondies in a glass casserole dish
Freshly baked chocolate chip blondies in a glass casserole dish
This is the sort of Midwestern pantry dessert that feels nostalgic, tastes indulgent, and can be pulled together in the time it takes the oven to preheat.
Let the blondies cool just long enough to slice, then serve slightly warm so the chocolate is still melty. They’re lovely on their own with a cup of coffee or tea, or alongside a scoop of vanilla ice cream for something a bit more decadent.
For a family-style dessert, bring the entire glass casserole dish right to the table and let everyone cut their own squares. These also travel well for potlucks and game nights—just cover the cooled pan tightly and tuck in a bag with a small offset spatula or butter knife for easy serving.
3-Ingredient Chocolate Chip Blondies
Servings: 12
Ingredients
1 (15.25–16.5 oz) box yellow cake mix
1/2 cup (1 stick, 113 g) unsalted butter, melted and slightly cooled
1 cup semisweet chocolate chips, plus a small handful for sprinkling on top
Cake mix, melted butter, and chocolate chips arranged for blondies
Cake mix, melted butter, and chocolate chips arranged for blondies
Directions
Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch glass casserole dish with butter or nonstick spray, paying attention to the corners so the blondies release cleanly.
In a medium bowl, whisk the dry yellow cake mix with a fork or whisk to break up any lumps. This helps the batter mix evenly and bake with a more even crumb.
Pour the melted, slightly cooled butter over the cake mix. Using a sturdy spatula or wooden spoon, stir until the mixture forms a very thick, soft dough. It will look more like cookie dough than cake batter and may seem crumbly at first; keep pressing and folding until no dry pockets of mix remain.
Thick blondie dough being mixed in a bowl
Thick blondie dough being mixed in a bowl
Fold in 1 cup of chocolate chips, distributing them as evenly as possible throughout the dough so every bite has a bit of chocolate.
Transfer the dough to the prepared glass casserole dish. Use the spatula or clean, lightly buttered fingertips to press it firmly and evenly into the pan, pushing it into the corners and smoothing the top. Sprinkle a small handful of extra chocolate chips over the surface for a bakery-style look.
Unbaked blondie dough pressed into a glass baking dish
Unbaked blondie dough pressed into a glass baking dish
Bake on the center rack for 18–23 minutes, or until the top is lightly golden brown and the edges are just set. The center should look slightly soft and may jiggle just a touch when you move the pan—this is what keeps the blondies gooey once cooled.
Remove the pan from the oven and place it on a heatproof surface or cooling rack set on your countertop. Cool in the glass dish for at least 20–30 minutes; the residual heat will finish setting the center without overbaking.
Once the blondies are just warm to the touch, cut into 12 squares (3 rows by 4 rows) using a sharp knife. For the cleanest cuts, wipe the knife between slices. Serve directly from the glass casserole dish and watch the pan vanish long before dinner is served.
Warm blondies cut into squares with melty chocolate
Warm blondies cut into squares with melty chocolate
Variations & Tips
For a slightly chewier texture, you can reduce the butter to 7 tablespoons instead of a full 1/2 cup; this yields a firmer, more bar-like blondie that slices very cleanly. If you prefer a sweeter, more classic chocolate chip cookie flavor, use milk chocolate chips instead of semisweet.
For a deeper, more complex taste, stir in a pinch (1/4 teaspoon) of fine salt and 1 teaspoon of vanilla extract—this technically adds ingredients, but the base 3-ingredient method remains the same. To make smaller portions for a gathering, bake the batter in a parchment-lined 8x8-inch glass dish for slightly thicker blondies and cut them into bite-sized squares; add 3–5 minutes to the bake time and watch closely.
If you live in a very warm or humid climate, let the blondies cool completely before covering to avoid condensation in the glass dish, which can make the top sticky. For food safety and quality, allow the melted butter to cool slightly before mixing so it doesn’t overheat the chocolate chips or make the dough greasy, and avoid leaving the blondies at room temperature for more than 2 days; after that, cover tightly and refrigerate for up to 5 days, bringing them back to room temperature or gently warming in a low oven before serving.

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