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["In a bowl, whisk together flour, baking powder and salt.", "In work bowl of a stand mixer, cream together butter, white sugar and light brown sugar on medium-high until fluffy, about 2 minutes.", "About halfway through, scrape down sides and bottom of bowl with a spatula.", "While mixer is running, add eggs one a time.", "When well combined, alternate adding flour mixture by thirds and milk divided in half (that is, add 1/3 of the flour then 1/2 the milk, then half the remaining flour, the rest of the milk, then the last of the flour).", "Mix until just incorporated; do not over mix.", "Stir briefly by hand to finish.", "Toss 1/2 c frozen blueberries with 1 t flour, then fold them into the batter.", "Grease and flour a 9x13x2"" baking pan.", "Pour batter into prepared pan and spread evenly.", "Sprinkle remaining 1/2 c frozen blueberries evenly over the top of the cake batter.", "Stir cinnamon into sugar and sprinkle over the top.", "Place pan in a preheated 350F oven on the middle rack for 40-45 minutes or until a toothpick inserted in the center comes out clean.", "Rotate pan 180 halfway through.", "Cool in pan 20 minutes, then turn entire cake out onto a rack, then invert onto a cutting board."]
