Preheat your oven to 350°F and grease a standard 12-cup muffin tin with butter or cooking spray. While the oven heats, blend the cottage cheese in a food processor or blender until completely smooth—this is crucial for achieving a tender crumb without visible curds. Zest your lemon fresh and set aside, then gently toss the blueberries with a tablespoon of flour from your measured amount; this prevents them from sinking to the bottom during baking.

In a medium bowl, whisk together the flour (minus the 1 tablespoon used for the blueberries), baking powder, baking soda, salt, and ground cinnamon. Whisking instead of just stirring incorporates air and distributes the leavening agents evenly throughout the flour, which helps your muffins rise beautifully and stay tender.

In a large bowl, gently whisk together the melted and cooled butter and sugar until combined—don't overmix. Add the eggs one at a time, whisking until just incorporated after each addition, then add the vanilla extract. Fold in the blended cottage cheese and lemon zest using a spatula until the mixture is smooth and homogeneous. I find that keeping the butter at room temperature and folding rather than beating helps maintain a tender crumb and prevents the batter from becoming too dense.

Pour the wet ingredient mixture from Step 3 into the bowl with the dry ingredient mixture from Step 2. Using a spatula or wooden spoon, gently fold the ingredients together until just combined—stop as soon as you don't see streaks of dry flour. The batter should look slightly lumpy; overmixing develops gluten and makes tough muffins. Gently fold in the blueberries that you prepared in Step 1, being careful not to crush them.

Divide the batter evenly among the muffin cups, filling each about two-thirds full. For even results, I use a small ice cream scoop or cookie scoop to ensure each muffin gets the same amount of batter. Place the tin in your preheated 350°F oven and bake for 20-22 minutes, or until a toothpick inserted into the center of a muffin comes out clean or with just a few moist crumbs.

Remove the muffin tin from the oven and let the muffins cool in the pan for 5-10 minutes. This short resting period allows them to set slightly while still being warm and tender, making them easier to remove without breaking. Run a thin knife around the edges of each muffin to loosen them, then gently turn them out onto a wire rack to cool completely.