Preheat the oven to 350°F (175°C).

Line a muffin tin with paper liners or spray it with cooking spray.

In a large mixing bowl, whisk together the flour, sugar, baking powder, salt, and poppy seeds.

In another bowl, mix the milk, vegetable oil, eggs, and vanilla extract.

Pour the wet ingredients into the dry ingredients and stir gently with a rubber spatula until just combined.

Divide the batter evenly among the muffin cups, filling each about two-thirds full.

Bake in the preheated oven for 18 to 20 minutes or until a toothpick inserted in the center comes out clean.

Allow the muffins to cool in the tin for a few minutes before transferring them to a wire rack.