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Preheat oven to 350 degrees and prepare a 9-inch round baking dish by spraying with nonstick cooking spray.
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In a large bowl, combine the pumpkin puree, brown sugar, eggs, pumpkin pie spice, baking powder, cinnamon, vanilla extract and salt. Whisk to mix.
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Add the milk and whisk until combined.
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Stir in the oats and set bowl aside.
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To make the streusel topping, combine apples, flour, brown sugar, salt, and cinnamon in a medium mixing bowl. Stir to mix. Pour the melted butter into the bowl and stir to combine.
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Pour the oat mixture into the prepared baking dish and spread it evenly.
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Top the oatmeal mixture with the streusel mixture.
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Bake uncovered for 45 minutes. Allow to rest for 5 minutes before serving.