Swedish Sticky Chocolate Cake (Kladdkaka)

Ingredients

• tablespoons butter
• sugar
• eggs
• tablespoons unsweetened cocoa powder
• all-purpose flour
• teaspoon vanilla extract
• teaspoon kosher salt
• heavy cream
• ounces semisweet chocolate chips
• teaspoon pure vanilla extract
• flaky sea salt
• whipped cream, mint sprigs
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