Prepare the Rice Cooker by greasing the inner pot generously with melted butter or oil.

Mix Dry Ingredients by whisking together flour, baking powder, sugar, and salt in a bowl.

Mix Wet Ingredients by whisking the egg, milk, melted butter, and vanilla extract until smooth.

Combine Mixtures by pouring the wet mixture into the dry ingredients and folding gently until just combined.

Cook the Pancake by pouring the batter into the rice cooker and starting the cooking cycle for 30-45 minutes.

Check Doneness by inserting a toothpick into the center; if it comes out clean, it's ready.

Cool and Serve by allowing the pancake to rest for 5 minutes before slicing and serving with toppings.