1. Preheat the oven to 375 ° F. Coat a muffin tin with the cooking spray. 2. In a medium bowl, sift together the all-purpose flour, whole-wheat flour, baking powder, baking soda, and salt. 3. In a large bowl, mix together the ricotta and applesauce until well combined. Add the brown sugar, lemon juice, and eggs, and mix until smooth. 4. Gently fold the dry ingredients into the wet ingredients, being careful not to overmix the batter. Fold in the cranberries, making sureto evenly distribute them throughout the batter. 5. Scoop ¼ cup of batter into each muffin cup. Evenly sprinkle each muffin with the lemon zest. 6. Bake until the muffins are golden brown on top and a toothpick inserted in the center comes out clean, 18 to 22 minutes. Let the muffins cool for 5 minutes, then transfer the muffins to a wire rack to finish cooling for another 10 minutes. FREEZE: Individually wrap the muffins in plastic wrap or in individual freezer-safe containers for up to 3 months. Thaw at room minutes.