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Preheat the oven to 375 degrees F.
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Grease a 9 x 5 loaf pan. (Grease very! well as there are so many blueberries that only half of the loaf may come out--it is still tasty, but not presentable!).
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Stir the topping ingredients together and set aside.
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In a medium-size bowl, cream the butter and sugar. Then mix in the egg. Mix in the milk and beat until mostly smooth.
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In another bowl, mix the flour with the baking powder and salt.
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Mix the dry ingredients into the wet ingredients.
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Fold in the blueberries and the lemon zest.
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Pour the batter into the loaf pan and sprinkle with topping.
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Bake until the topping is deep golden brown and has formed a thick crust--approximately 50 minutes.
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Cool in pan 5 minutes before transferring to a wire rack to finish cooling.