01 -
Heat oven to 350°F. Butter 9x13 pan.
02 -
Mix brown sugar, flour, cinnamon, salt. Mash in butter until crumbly.
03 -
Mix sugar, flour, and cinnamon for middle layer.
04 -
Beat dry ingredients with butter until sandy. Mix wet ingredients separately, then combine into smooth batter.
05 -
Spread half batter in pan, add cinnamon mix, top with remaining batter and streusel.
06 -
Cook 55 minutes until toothpick comes out clean. Cool 1 hour.