Low FODMAP Chocolate Pumpkin Marble Cake - FODMAP Everyday

Ingredients

• 1 1/2 cups (339; 3 sticks) unsalted butter, (at room temperature, cut into pieces)
• 3 cups (594 g) sugar
• 2 teaspoons vanilla extract
• 6 large eggs, (at room temperature)
• 1 1/4 cups (305 g) solid-pack pure canned pumpkin, ( such as Libby’s)
• 3/4 teaspoon ground cinnamon
• 1/4 teaspoon freshly ground nutmeg
• 1/8 teaspoon ground cloves
• 2 3/4 cups (399 g) low FODMAP gluten-free all-purpose flour,
• 2 teaspoons baking powder; (use gluten-free if following a gluten-free diet, divided)
• 1 teaspoon salt (divided)
• 3/4 cup (64 g) sifted Dutch-processed cocoa, (plus extra)
• 2/3 cup (165 ml) “faux” buttermilk
• 4- ounces (115 g) semisweet chocolate, (preferably about 50% cacao, finely chopped)
• ½ cup (120 ml) lactose-free heavy cream
• 1 tablespoon unsalted butter
• 1 teaspoon light corn syrup