Preheat oven to 350 degrees. Spray 12 standard size muffin cups with nonstick cooking spray. In a medium bowl, combine flour, salt and baking soda; set aside.
In a bowl of an electric mixer fitted with the paddle attachment, beat cream cheese at medium speed until smooth. Add sugar, lemon zest and lemon juice and beat until smooth, about 2 to 3 minutes. Using a pastry bag or spoon, fill cookie cups with filling. Top with mixed berries. Serve immediately
*Nutritional information is an estimate. Please consult a doctor or nutritionist for the most accurate nutritional info.