This easy s'mores loaf cake brings campfire flavors to your kitchen—graham cracker crumb batter studded with chocolate chips and crowned with toasted mini marshmallows. One bowl, simple steps, and irresistibly gooey slices.
Preheat oven to 350°F. Grease a 9×5 inch loaf pan and line it with a parchment sling.
Whisk flour, graham crumbs, baking powder, baking soda, and salt in a large bowl.
In a separate bowl, whisk granulated sugar, brown sugar, melted butter, and oil until combined. Whisk in eggs and vanilla until smooth.
Whisk in milk and sour cream. Add dry ingredients and stir just until no dry streaks remain.
Fold in 1.25 cups chocolate chips and 2 cups mini marshmallows. Spread batter in the pan and smooth the top.
Bake 50 to 55 minutes, until a tester inserted in the center comes out with a few moist crumbs (avoid marshmallow pockets when testing).
Top with 1.5 cups mini marshmallows and 0.25 cup chocolate chips. Return to the oven for 2 to 4 minutes or broil 30 to 60 seconds to toast. Watch closely.
Cool in pan 15 minutes, then lift out to a rack. Sprinkle crushed graham crackers on top. Cool at least 30 minutes before slicing with a lightly oiled knife.
Notes
For extra campfire vibes, drizzle melted chocolate over the toasted marshmallows. Store covered at room temperature up to 2 days or refrigerate up to 5 days. Rewarm slices briefly to re-soften the marshmallows.