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Gather all ingredients.
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Preheat the oven to 350 degrees F (180 degrees C).. Coat a 9x13-inch baking pan with cooking spray, and line with parchment paper, leaving a 2-inch overhang on long sides.
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Beat butter and sugar with an electric mixer in a large bowl on medium speed until light and fluffy, about 2 minutes. Add eggs 1 at a time, beating well after each addition. Beat in vanilla until combined.
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Whisk flour, baking powder, baking soda, and salt together in a separate bowl. Gradually add to butter mixture; beat on medium speed until just combined, about 1 minute. Fold in pecans, dates, coconut, and chopped maraschino cherries.
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Sprinkle half the crushed cornflakes evenly in the bottom of the prepared pan. Dollop dough evenly over cornflakes; press gently using wet hands into an even layer, about 1/2 inch to 3/4 inch thick.
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Sprinkle remaining 1 cup crushed cornflakes evenly over top, pressing lightly to adhere. Top evenly with quartered maraschino cherries.
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Bake in the preheated oven until edges are set and center no longer appears wet, 28 to 30 minutes. Bars should be lightly golden and slightly puffed.
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Cool completely in pan on a wire rack, 1 hour and 30 minutes to 2 hours. Cut into 8 (3 1/4x4 1/2 inch) bars.