On low speed, cream butter and sugar until fluffy. Add eggs, one at a time, and mixuntil blended.

Sift dry ingredients and add alternately with milk and vanilla. Fold in blueberries until evenly distributed.

Grease muffin tin all over with mazola spray. Pile mix high in each muffin cup. Sprinkle with sugar over tops.

Bake in 375 oven for 22 mins. Cool in pan for at least 30 mins. before taking out.