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Export 7 ingredients for grocery delivery
Step 1
Heat oven to 350 degrees, and lightly grease an 8-inch square baking pan.
Step 2
Melt unsweetened chocolate and butter in a small saucepan over low heat, stirring frequently until smooth.
Step 3
Using a rubber spatula, scrape chocolate mixture into large bowl. Whisk in oil and sugar, and let cool for about 5 minutes.
Step 4
As the chocolate mixture cools, whisk together flour, cocoa powder and salt in a medium bowl.
Step 5
Whisk eggs into cooled chocolate mixture until well combined, then whisk in vanilla. Using a rubber spatula, fold in flour mixture. Fold in most of the chocolate chunks, reserving the larger chunks to place on top.
Step 6
Scrape batter into prepared pan and smooth it into an even layer. Scatter the reserved chocolate chunks on top. Sprinkle lightly with flaky sea salt, and bake until the top is set and firm to touch, 17 to 23 minutes. Transfer the pan to a wire rack to cool completely before cutting into 16 squares.