Ingredients (15)

• 1/2 cup plus 3 tablespoons (5 1/2 ounces) unsalted butter, softened, more for the pan
• 1/3 cup (66 grams) granulated sugar
• 1 1/2 cups (180 grams) all-purpose flour
• 1 teaspoon pure vanilla extract
• 1/4 teaspoon fine salt
• 1/2 cup (85 grams) chocolate chunks or chips, optional
• 1 (14-ounce) can sweetened condensed milk
• 1/2 cup plus 1 tablespoon (4 1/2 ounces) unsalted butter
• 3/4 cup packed (160 grams) dark brown sugar
• 3 tablespoons light corn syrup
• 1/2 teaspoon pure vanilla extract
• 1/4 teaspoon fine salt
• 1 1/4 cups (185 grams) good quality semi-sweet chocolate chunks (58 to 70% cacao)
• 1/3 cup heavy cream
• 1 teaspoon flaky salt, such as Maldon, for garnish, optional