preheat oven to 350
mix flour, baking powder, baking soda, salt and sugar together
In a seperate bowl mix eggs, milk, vanilla and ¾ cup oil or melted butter together
add wet ingredients to dry ingredients and mix well
lightly grease a 9 x 13 pan and pour half the batter in. Batter will be a little thick so shake pan to spread out evenly.
mix together brown sugar and cinnamon and spread half over batter
use a spoon to add spoonfuls of batter over the top and gently spread out with wet fingers.
top with remaining cinnamon and brown sugar
drizzle with 3 tbsp melted butter
Cover with foil and bake in oven for 20 minutes then remove foil and bake for another 20 minutes until toothpick inserted in middle comes out clean. Do not overbake or it will be dry.
let cool for 10 minutes then drizzle with glaze