These fudgy walnut brownies are sensational! They have a dense fudgy chocolatey brownie base loaded with walnuts and a thin layer of silky smooth chocolate ganache.
These walnut brownies are such a classic treat. Like my cosmic brownies, they remind me of those little packaged walnut brownies from Little Debbie's that mom used to pack in my lunch. Except better.
Whisk together eggs, egg yolk, brown sugar, vegetable oil, melted butter, and vanilla extract. Then add sour cream and continue to whisk until batter is smooth.
Line a 9x9 baking dish with parchment paper. Pour batter into baking dish and bake for 25-30 minutes, until center of the batter is only slightly jiggly.