Preheat your oven to 375 degrees and line 18 muffin cups with paper liners.
Rinse and pat the raspberries dry. Set aside.
Grate the zucchini and set aside.
In a large mixing bowl, beat the lemon zest and sugar together until the sugar has a yellow tint.
Add the butter and cream well.
Beat in the large eggs, FRESH lemon juice, and lemon extract.
Add the baking powder, baking soda, and salt.
In a separate bowl or measuring cup, whisk together the sour cream and milk.
Due to the rate of absorption of the liquid into the flour, this recipe uses a slightly different method that mixes the wet ingredients into the dry ingredients.
Add just ⅓ of the flour to the batter.
Stir in ½ of the milk/sour cream.
Mix in another ⅓ of the flour.
Stir in the last half of the milk.
Fold the grated zucchini and raspberries in with the last of the flour. Fold just until combined.
Divide the batter among the 18 prepared muffin tins. The muffin cups will be really full.
Bake in the preheated oven (375 degrees) for 18 minutes. A toothpick should come out of the center of a muffin clean, and each muffin top will just be beginning to brown.
Cool completely on wire racks and serve.
Store in a lightly covered container instead of an airtight container. An airtight container will make these a little soggy.