Preheat the oven to 350°F (175°C). Grease a 9x13-inch baking dish.
In a large bowl, sift together mochiko, baking powder, and sugar. In another bowl, mix eggs, pumpkin puree, condensed milk, melted butter, and vanilla extract. Stir the egg mixture into the mochiko mixture, then pour it into the prepared dish.
Bake for 1 hour. Let it cool before serving.
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