These oven baked root beer barrel blondie bars are the kind of easy dessert that feels made for a busy weeknight when you want something fun without pulling out a long ingredient list. The candies melt and soften into the blondie base as it bakes, giving the bars a buttery caramelized texture with that classic old-fashioned root beer candy flavor, and the simple glass dish method makes cleanup almost as easy as the recipe itself.
Serve these bars slightly warm or fully cooled with a cold glass of milk, hot coffee, or even a scoop of vanilla ice cream if you want to lean into the soda-shop vibe. For potlucks and family movie nights, I like cutting them into smaller squares since they are nice and sweet, and they also pack well in lunchboxes or dessert trays alongside simple fruit like sliced apples or strawberries.
Oven Baked 5-Ingredient Root Beer Barrel Blondie Bars
Servings: 16 bars
Ingredients
1 box yellow cake mix (about 15.25 ounces)
2 large eggs
1/2 cup unsalted butter, melted
1 teaspoon vanilla extract
20 to 24 whole unwrapped root beer barrel candies
Directions
1. Preheat the oven to 350°F and lightly grease a clear glass 9x13 baking dish.
2. In a large mixing bowl, stir together the yellow cake mix, eggs, melted butter, and vanilla extract until a thick blondie batter forms.
3. Spread the batter evenly into the prepared baking dish, then press the whole unwrapped root beer barrel candies across the top, spacing them out so each serving gets a few pieces.
4. Bake for 22 to 28 minutes, or until the edges are golden brown and the center is set. The candies will soften and melt into the bars as they bake.
5. Let the bars cool in the pan for at least 30 minutes before slicing into squares and serving.
Variations & Tips
For cleaner slices: Let the bars cool completely before cutting, and lightly grease the knife between slices. Because the candy can stay a little tacky, this helps keep the edges neater.
For a stronger root beer flavor: Add 1/2 teaspoon of root beer extract if you happen to have it on hand. It gives the bars a more pronounced soda-shop taste without changing the simple method.
For a softer candy texture: Press the candies a little deeper into the batter before baking so they melt more fully into the bars instead of sitting mostly on top.
For easy make-ahead dessert: Store the cooled bars tightly covered at room temperature for up to 3 days. If you like them extra gooey, warm individual squares in the microwave for just a few seconds before serving.