Preheat oven to 400 degrees. Line a muffin tin with non-stick silicone baking cups or paper liners that have been sprayed with non-stick baking spray. Set prepared pan aside.
In a mixing bowl, whisk together the dry ingredients; flour, sweetener, baking powder, baking soda and salt. Set aside.
In a second bowl, whisk together the wet ingredients; yogurt, milk, eggs and oil. Gradually add the dry ingredient mixture to the wet ingredients, using a whisk to combine. Batter will be slightly thick.
Add in the lemon juice, lemon zest and poppy seeds. Stir to combine.
Spoon the batter into the prepared muffin tin, filling each cup to nearly full.
Bake the muffins at 400 degrees for 16-18 minutes or until toothpick inserted into a muffin comes out clean and crumb-free. Tops of muffins will be golden brown.
Remove from oven and let cool while you mix the lemon glaze. Combine the Swerve confectioners sugar substitute with 2 tbsp of lemon juice, stirring until smooth. Drizzle over the tops of each muffin. Enjoy!