In a food processor, pulse the oatmeal until it's coarsely ground.
Meanwhile, preheat the oven to 350 degrees, and grease each skillet with butter.
In a small mixing bowl, sift the flour, baking soda, and salt. Stir in the oats.
In a large mixing bowl, cream the butter, sugar, vanilla, and lemon juice. Add the eggs and stir until combined.
Stir the flour mixture into the butter mixture, until just combined. Stir in ¾ cup each of the chips, marshmallows, and crackers.
Put ⅔ cup of dough into each skillet. Bake for 15 minutes. Remove from oven and top with the rest of the chips, marshmallows, and graham crackers. You can use a kitchen torch to brown the marshmallows, if you like.