Preheat oven to 400°F.
In a large mixing bowl, combine butter, oil and sugar.
Mix in lemon zest, lemon juice, egg, milk and vanilla.
Mix in poppy seeds, whole wheat flour, baking powder and salt. Mix just until combined.
Measure into paper lined or greased muffin tins.
Bake at 400 degrees for 12-14 minutes.
Let cool slightly for 1-2 minutes and then remove from tin. Continue cooling on a baking rack.
Mix powdered sugar and lemon juice together.
While muffins are still warm, but not hot drizzle with glaze.
