HEAT THE OVEN TO 350F DEGREES. GREASE AND FLOUR, OR LINE THE BOTTOM OF A 9×5 INCH (900G) LOAF TIN (FOR EASIER RELEASE OF THE CAKE).

MIX THE MASHED BANANAS TOGETHER WITH THE MILK AND SET ASIDE. WHISK TOGETHER THE FLOUR, SALT, BAKING SODA AND BAKING POWDER. SET ASIDE AS WELL. BEAT THE BUTTER AND SUGAR TOGETHER UNTIL LIGHT AND CREAMY. ADD THE EGGS, ONE AT A TIME UNTIL FULLY INCORPORATED. ADD THE BANANA/MILK MIXTURE AND THE VANILLA EXTRACT AND STIR TO COMBINE. FOLD IN THE FLOUR A 1IN 3 BATCHES UNTIL WELL INCORPORATED. POUR BATTER INTO THE PREPARED TIN AND SPREAD EVENLY. MAKE THE CRUMBLE BY COMBINING INGREDIENTS WITH A FORK, THEN SPREAD EVENLY ON TOP OF THE BATTER.

BAKE FOR 45 MINUTES THEN TURN THE OVEN DOWN TO 325F AND COOK FOR A FURTHER 15 MINUTES UNTIL THECAKE IS DONE, INSERT A TOOTHPICK, IT SHOULD COME OUT CLEAN. BE CAREFUL NOT TO BURN YOUR TOPPING IF USING (I ALMOST DID).

LET COOL ON A WIRE RACK BEFORE REMOVING FROM THE TIN.