Miniature Solar Marshmallow S’more Oven

45 mins Ages 4-6 Outdoor

A playful, screen-free adventure designed to spark curiosity, sensory exploration, and fine motor skills for kids aged 4 to 6.

Materials Needed

  • • Cardboard shoebox with attached lid (1 unit)
  • • Aluminum foil (1 roll)
  • • Clear plastic food wrap (1 roll)
  • • Matte black construction paper (1 sheet)
  • • Graham crackers, mini marshmallow, and chocolate square (1 serving)
  • • Tape or glue stick (1 set)

Pro Tips

  • → Line the inside of a shoebox with aluminum foil to reflect solar rays inward.
  • → Place black paper on the bottom to absorb heat, and seal the top with clear plastic wrap to trap warm air.
  • → Prop the foil-covered lid at an angle so it bounces extra sunlight into the box.

Safety First

Do not leave food unattended outdoors. Oven gets warm to the touch.

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Step-by-Step Instructions

1

Step 1

Line the interior walls and lid flap of a shoebox with smooth aluminum foil, shiny side facing up.

2

Step 2

Place a sheet of black cardstock flat on the floor of the box to act as a heat-absorbing plate.

3

Step 3

Place a graham cracker topped with chocolate and a marshmallow on the black paper, sealing the box opening with clear plastic wrap.

4

Step 4

Angle the foil lid to bounce sunlight into the box and leave in direct sun for 25 minutes to melt the treat.

What they are learning

Solar radiation thermal absorption Greenhouse heat-trapping effect Thermal reflective focusing