
These fudgy, deeply chocolatey brownies are loaded with gooey marshmallows, melted chocolate chips, and toasted walnuts — everything you love about rocky road, baked right into a single pan. Flax eggs stand in seamlessly for conventional eggs, creating a rich, dense batter that bakes up with perfectly set edges and a soft, brownie-shop center. Vegan butter and non-dairy milk round out the swap list, so there's no animal-derived ingredient in sight without any sacrifice to texture or flavor. The two-stage bake is the real magic here: the marshmallows puff and turn golden while the chocolate chips go soft and melty, and then a warm chocolate drizzle ties the whole thing together. Toasting the walnuts before they go on top adds a nutty depth that keeps every bite from tipping into pure sweetness. The batch cuts into 16 squares, which makes this an ideal dessert for a crowd, a potluck, or honestly just a very good week at home.
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Preheat the oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper, leaving an overhang on two sides.
In a small bowl, stir together the ground flaxseed and 6 tbsp water. Set aside for 5 minutes until the mixture thickens to a gel.
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