Prince Louis showed his love of s’mores during his first royal engagement Monday.

While volunteering with his family at 3rd Upton Scouts Hut in Slough, the 5-year-old royal took a break from shoveling and operating a digger to enjoy a sweet treat around a campfire.

The little one was filmed enthusiastically biting a marshmallow off of a stick before reaching for the one his mom, Kate Middleton, held.

When Louis finally got his hands on the graham cracker, chocolate and marshmallow combo, he took a big bite and danced around in post-dessert bliss, bumping into sister Princess Charlotte.

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The siblings and older brother Prince George continued toasting marshmallows side-by-side while struggling to keep smoke out of their eyes.

The mini royals also all tried their hands at archery.

Additionally, Charlotte, 8, was photographed varnishing a door, while Louis pushed a wheelbarrow with Middleton’s help.

The Prince and Princess of Wales’ youngest child, who wore a striped shirt tucked into blue shorts for Monday’s Big Help Out holiday, previously missed the coronation concert on Sunday evening.

However, Charlotte and George, 9, made headlines for getting their groove on during Lionel Richie’s performance, waving flags and cheering.

Charlotte skipped out on the Big Lunch at Windsor Castle earlier that same day because she needed to rest after “making sure her little brother behaved himself” at King Charles III’s coronation Saturday, William, 40, reportedly joked.

Louis stole the show during the hours-long ceremony, with his incessant yawning and silly faces.

Charlotte sat by Louis during the service — when he wasn’t briefly whisked away — and held his hand on their way in.

As for George, the future king entered and exited separate from his family members as one of Charles’ Pages of Honor.