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Preheat your oven to 350°F. Line a 9x9 inch baking pan with parchment paper, ensuring there's an overhang on two sides to easily lift the brownies out later. Lightly grease the parchment paper.

In a medium bowl, whisk together the large eggs, unsweetened cocoa powder, salt, baking powder, espresso powder, and vanilla extract until well combined and smooth. Set this mixture aside.

In a separate large, microwave-safe bowl, combine the melted unsalted butter and granulated sugar. Microwave in 30-second intervals, stirring well after each, until the sugar is completely dissolved and the mixture appears shiny. This process typically takes about 1 1/2 to 2 minutes total.

Pour the egg mixture into the warm butter and sugar mixture. Whisk vigorously for about 1 minute until the mixture thickens and becomes glossy.

Gently fold in the all-purpose flour with a spatula until just combined. Be careful not to overmix, as excessive mixing can result in a cakey texture for your brownies.

Pour the brownie batter into the prepared 9x9 inch baking pan and spread it evenly. Bake for 30 to 33 minutes, or until a toothpick inserted into the center comes out with moist crumbs, but no wet batter.

Remove the brownies from the oven and allow them to cool completely in the pan on a wire rack. This is crucial for the ganache application.

While the brownies cool, prepare the chocolate ganache topping. In a microwave-safe bowl, heat the heavy cream in 20-second increments until it just begins to simmer, which should take about 1 minute total.

Add the chopped semi-sweet chocolate to the hot cream. Let it sit undisturbed for 5 minutes, then whisk gently until the ganache is smooth and glossy.

Once the brownies are completely cool, pour the chocolate ganache evenly over the top. Immediately sprinkle with rainbow sprinkles for that classic 'cosmic' look.

Transfer the pan to the refrigerator and chill for at least 2 hours, or until the ganache is fully set. Once set, use the parchment paper overhang to lift the brownies out of the pan and cut them into 4 large squares to serve.


Preheat your oven to 350°F. Line a 9x9 inch baking pan with parchment paper, ensuring there's an overhang on two sides to easily lift the brownies out later. Lightly grease the parchment paper.

In a medium bowl, whisk together the large eggs, unsweetened cocoa powder, salt, baking powder, espresso powder, and vanilla extract until well combined and smooth. Set this mixture aside.

In a separate large, microwave-safe bowl, combine the melted unsalted butter and granulated sugar. Microwave in 30-second intervals, stirring well after each, until the sugar is completely dissolved and the mixture appears shiny. This process typically takes about 1 1/2 to 2 minutes total.

Pour the egg mixture into the warm butter and sugar mixture. Whisk vigorously for about 1 minute until the mixture thickens and becomes glossy.

Gently fold in the all-purpose flour with a spatula until just combined. Be careful not to overmix, as excessive mixing can result in a cakey texture for your brownies.

Pour the brownie batter into the prepared 9x9 inch baking pan and spread it evenly. Bake for 30 to 33 minutes, or until a toothpick inserted into the center comes out with moist crumbs, but no wet batter.

Remove the brownies from the oven and allow them to cool completely in the pan on a wire rack. This is crucial for the ganache application.

While the brownies cool, prepare the chocolate ganache topping. In a microwave-safe bowl, heat the heavy cream in 20-second increments until it just begins to simmer, which should take about 1 minute total.

Add the chopped semi-sweet chocolate to the hot cream. Let it sit undisturbed for 5 minutes, then whisk gently until the ganache is smooth and glossy.

Once the brownies are completely cool, pour the chocolate ganache evenly over the top. Immediately sprinkle with rainbow sprinkles for that classic 'cosmic' look.

Transfer the pan to the refrigerator and chill for at least 2 hours, or until the ganache is fully set. Once set, use the parchment paper overhang to lift the brownies out of the pan and cut them into 4 large squares to serve.
