Preheat convection oven to 375 degrees Fahrenheit and line a standard 12-cup muffin tin with non-stick parchment liners.
Sift the gluten-free flour blend, baking powder, and salt into a primary mixing bowl then whisk in the sugar and poppy seeds to ensure even distribution.
In a secondary vessel, emulsify the eggs, vegetable oil, Greek yogurt, lemon juice, lemon zest, and vanilla extract until the mixture is homogenous.
Hydrate the dry ingredients by folding in the wet mixture using a silicone spatula until no dry particulates remain, taking care not to over-agitate.
Distribute the batter equally across the 12 muffin cells using a 50ml scoop to ensure uniform baking.
Bake for 20 minutes or until the internal temperature reaches 205 degrees Fahrenheit and the surface springs back upon light pressure.
Transfer the muffin tin to a cooling rack for 5 minutes before removing individual muffins to prevent steam-induced sogginess.