Zutaten:

• 2 large eggs, at room temperature 
• Cooking spray 
• 8 tablespoons (1 stick) unsalted butter, diced 
• 2 ounces finely chopped bittersweet chocolate or chocolate chips (60% cacao, about 1/3 cup) 
• 3/4 cup all-purpose flour 
• 1/2 cup Dutch-processed cocoa powder, sifted if lumpy 
• 1/2 teaspoon kosher salt 
• 3/4 cup granulated sugar
• 1/4 cup packed light brown sugar 
• 1 teaspoon vanilla extract
• 1/3 cup heavy cream
• 1 pinch kosher salt
• 3 ounces finely chopped bittersweet chocolate or chocolate chips (60% cacao, about 1/2 cup) 
• 1 tablespoon rainbow candy-coated chocolate chips, such as Wilton’s