There are a lot of variations of this cake out there, here's one that I use (or adapt from). I just love the fresh taste of the lemon glaze.
1 yellow or lemon cake mix
1 c water
2 ts vanilla
1/2 c oil
1 T flour
poppyseeds (couple tablespoons, I eyeball it)
Mix it all together and bake in a greased bundt cake pan at 400 degress for 45 minutes. Allow to cool in pan 10 minutes then transfer to plate. Poke with fork then pour glaze over entire cake.
2 c powdered sugar, sifted
Beat these ingredients together until you get a glaze consistency and lemon taste that you like.