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Preheat your oven to 375°.
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Beat the egg in a bowl.
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Add sugar, milk, vanilla and oil, and stir until smooth.
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Add flour, salt and baking powder to the mixture, and stir only until smooth. Do not over-beat, or it will be tough.
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Spread in a 9x9 inch pan.
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In a separate bowl, make your topping: mix brown sugar, cinnamon, flour, melted butter and optional nuts.
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Sprinkle mixture over the top of the cake.
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Bake for 25 minutes.
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Let cool for 5 minutes and then serve.