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Preheat the oven to 350° F. Line a 9*11 inch baking dish with parchment paper and grease bottom and sides with cooking spray.
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In a mixing bowl, sift together flour, 3/4 cup of sugar and baking powder. Add shortening and mix until crumbly.
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In separate bowl combine milk, 1 egg, and lemon extract, Slowly add wet mixture to flour mix with mixer running on low speed for 1 minute, then on medium speed for 1 minute.
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Pour the batter into the prepared pan, and spread evenly. Sprinkle rasberries over the batter.
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In a medium bowl, stir together 2 beaten eggs, ricotta cheese, cream cheese 1/3 cup of sugar, key lime and vanilla extract, until smooth Spoon cheese mixture over the raspberries, and spread evenly. Top with pecans.
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Bake for 55 to 60 minutes in the preheated oven, until a knife inserted near the center comes out clean. Cool completely before cutting into squares and serving.