Pour sugar into a small or medium bowl. Zest ½ lemon over the sugar, then combine with your fingers to allow the lemon oil to release into the sugar.
To the same bowl add flour, baking powder and baking soda. Whisk together to combine.
Place cottage cheese, plain yogurt, vanilla, oil and 1 tablespoon milk in a separate mixing bowl.
Blend the wet ingredients using an immersion blender until mostly smooth. This is to avoid white curds in your muffins.
Once the mixture is smooth, add one egg and mix with a fork or a whisk until combined.
Add dry ingredients to wet and mix it in with a spatula until almost combined. Don't overmix the batter! It should be thick and wet. If it seems dry, add an additional tablespoon of milk.
Now fold in the blueberries until evenly distributed. Try not to break them.
Cover the bowl with batter with a clean kitchen towel and place in the fridge to rest for 30 minutes.
While the batter is resting, preheat the oven to 375 degrees Fahrenheit and place 6 muffin liners in a 12-muffin tin using every other space (see photos above for reference).
After 30 minutes divide the batter evenly between 6 muffin liners. They will be pretty full - that's intended.
Bake for 25-30 minutes, until a toothpick inserted in the middle comes out clean.
Place on a cooling rack for at least 15 minutes before serving.