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Prepare oven and baking pan: Preheat oven to 350°F. Grease a 13- x 9-inch baking pan with butter.
Add pie filling: Spread blueberry pie filling evenly in prepared pan. Drizzle evenly with lemon juice.
Add cake mix: Sprinkle cake mix evenly over pie filling.
Add butter and cinnamon: Place butter slices evenly over dry cake mix, making sure most of cake mix is covered. Sprinkle with cinnamon.
Bake cake: Bake in preheated oven until golden brown and bubbly, about 35-40 minutes. Remove from oven and let cool 10 minutes. Serve warm.