Irresistibly Gooey S'mores Cake Recipe for Campfire Lovers - The Pass and Provisions

Ingredients

• 1 ¾ cups (220 g) all-purpose flour
• ¾ cup (75 g) unsweetened cocoa powder
• 1 cup (200 g) granulated sugar
• ½ cup (100 g) brown sugar
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• ½ teaspoon salt
• 2 large eggs
• ½ cup (120 milliliters) vegetable oil
• 1 teaspoon vanilla extract
• 1 cup (240 milliliters) buttermilk (or milk + 1 teaspoon vinegar)
• ½ cup (120 milliliters) hot coffee or hot water
• 1 ½ cups (150 g) graham cracker crumbs
• ¼ cup (50 g) granulated sugar
• 6 tablespoons (85 g) butter, melted
• ½ cup chocolate ganache or melted chocolate
• Mini marshmallows (for toasting)
• Crushed graham crackers
• 4 large egg whites
• ¼ teaspoon cream of tartar