Preheat your oven to 350°F (175°C).
Prepare a muffin tin by greasing it or lining with paper liners.
In a large bowl, whisk together the all-purpose flour, whole wheat flour, baking powder, salt, and sugar.
In a separate bowl, mix the milk, vegetable oil, egg, and vanilla extract until well combined.
Make a well in the center of the dry ingredients and pour in the wet mixture, followed by the ground dandelion root.
Gently stir the mixture until just combined, being careful not to overmix.
Scoop the batter into the prepared muffin tin, filling each cup about two-thirds full.
Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the tin for 5 minutes before transferring to a wire rack.