Follow these simple steps to create your Lemon Poppy Seed Muffins:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line a muffin pan with paper liners or grease with butter.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
3. Combine Wet Ingredients: In a separate bowl, beat together the melted butter, eggs, yogurt, lemon juice, lemon zest, and vanilla extract until smooth.
4. Combine Mixtures: Pour the wet ingredients into the dry ingredients. Gently fold until just combined. Avoid over-mixing.
5. Add Poppy Seeds: Fold in the poppy seeds.
6. Fill Muffin Tin: Divide the batter evenly among the muffin cups, filling each about 2/3 full.
7. Bake: Place in the preheated oven and bake for 18-20 minutes or until a toothpick inserted into the center comes out clean.
8. Cool: Allow the muffins to cool in the pan for about 5-10 minutes before transferring them to a wire rack to cool completely.

These easy steps will guide you toward creating a delightful batch of Lemon Poppy Seed Muffins that are sure to impress!