Step 1

Heat oven to 180C. Grease and line an 8 or 9 inch pan with parchment paper.

Step 2

Cream the butter and brown sugar in large bowl, 2-3 minutes on medium speed until light and fluffy.

Step 3

Add the eggs one at a time until mixed, then vanilla.

Step 4

Add the flour, baking powder, salt and cinnamon and fold until just combined, then fold in the apple cubes. Batter will be thick! Spread into prepared pan.

Step 5

Combine all the crumble ingredients in a small bowl, pinching together with fingertips until small crumbs form, then scatter evenly onto cake surface.

Step 6

Bake for 40-45 minutes until toothpick comes out clean.