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["In a bowl, mix the powdered sugar, flour, and butter with your fingertips until obtaining a mixture close to a ""crumble"" (coarse sand).", "Set aside.In a saucepan, cook the blueberries in 2 tablespoons water over medium heat for 5 minutes.", "When the blueberries have burst, turn off the heat, and mash coarsely with a fork.", "Let cool.", "Preheat oven to 425 degrees Fahrenheit.", "In a bowl, mix the flour, baking soda and a pinch of salt, and make a well in the center.", "In another bowl, whisk the egg and the sugar until the mixture whitens.", "Add the butter and the oil and mix gently.", "Finally, add the buttermilk and the vanilla, continue mixing.", "When the mixture is smooth, pour in flour, and mix gently with a spatula.", "Do not mix too hard and too long: as soon as it is smooth, stop.", "Finally, add the remaining fresh blueberries.", "Pour a teaspoon of dough into each baking cup (you need to keep half the dough), then evenly distribute the crushed blueberries into the cups.", "Then cover with with another tablespoon of dough and top off with the streusel dough.", "Bake for 15-20 minutes: muffins should be golden, to test doneness, a knife should come out clean after being inserted in a muffin.", "Cool on a rack."]
