Lightly coat a 13-inch by 9-inch baking dish with olive oil; set aside.
Make the topping:
Use your hands or a pastry blender to turn the butter, sugar, flour, and cinnamon into small bits, ranging from the size of peas to the size of beans.
Set aside.
Make the batter:
In a large bowl, cream butter and sugar with an electric mixer until fluffy.
Add eggs, one at a time, beating after each addition until combined.
In a separate bowl, whisk together flour, salt, and baking powder.
With your mixer on a low speed, gradually add flour mixture to the wet batter until incorporated.
Transfer the batter to the baking dish and use a large offset spatula to smooth the surface.
Arrange the fruit in a fun pattern over the top and then sprinkle on the crumble, being careful to get it into the corners of the dish so that every bite includes it.
Bake until the top of the cake browns lightly and the tip of a sharp knife inserted in the center comes out clean, about an hour.