Preheat your oven to 350°F (175°C) and line an 8x8-inch pan with parchment paper. Skip this step and you’ll regret it later.
Mix melted butter and sugars in a large bowl until glossy and smooth. This is where that crinkly brownie top magic begins.
Add eggs and vanilla, whisking until fully combined. The batter should look thick and luxurious—like it knows it’s about to be amazing.
Stir in cocoa powder, flour, and salt just until combined. Don’t overmix unless dry, tough brownies are your thing (no judgment… okay, a little).
Pour the batter into the pan, spreading it evenly. Drop spoonfuls of peanut butter and Nutella all over the top like you’re feeling chaotic—in a good way.
Swirl gently with a knife or skewer. Fewer swirls = prettier contrast. More swirls = chaos brownies. Both are valid.
Bake for 30–35 minutes, until the edges are set and the center still looks slightly underdone. That’s how you get fudgy brownies, not brownie-flavored bricks.
Cool completely (or mostly… we’re not strict here) before slicing.