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

1. Preheat Oven: Preheat your oven to 375°F (190°C). Line a muffin tin with paper liners or grease it lightly.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, baking powder, salt, and poppy seeds until well combined.
3. Combine Wet Ingredients: In another bowl, whisk the eggs, then add milk, vegetable oil, lemon juice, lemon zest, and vanilla extract. Mix until combined.
4. Combine Mixtures: Gradually pour the wet ingredients into the dry ingredient mixture. Stir gently until just combined. Avoid over-mixing.
5. Fill Muffin Cups: Use a spoon or ice cream scoop to fill muffin cups about 2/3 full with batter.
6. Bake: Place the muffin tin in the preheated oven and bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
7. Cool: Once baked, remove the muffins from the oven and allow them to cool in the pan for about 5 minutes. Then transfer them to a wire rack to cool completely.

These step-by-step instructions will help ensure your muffins rise perfectly and remain moist and fluffy.