Heat oven to 350F. Prepare a 9-inch springform pan by greasing and flouring the bottom and sides.
In a bowl, mix together the flour, baking soda, salt, and cinnamon. In another bowl, mix together the banana, sour cream, and vanilla.
In a standing mixer fitted with the flat beater, cream together the butter and sugar on medium until light and fluffy, about 5 minutes.
Add the eggs one at a time, beating 30 seconds after each.
Scrape down the sides with a silicone spatula, then turn the mixer to low and add the flour mixture and banana mixture in turns. Start with 1/3 of the flour, then 1/2 the banana, 1/3 flour, 1/2 banana, and finish with 1/3 the flour.
Give the batter a couple of stirs to finish mixing in the last bits of flour, then scrape the batter into the prepared pan. Top with the strawberries, strewing them out evenly. Finish by crumbling the topping over.
Bake the cake for 60-70 minutes, or until the temperature in the center reaches 105-110F.
Let rest on a cooling rack for 15 minutes. Then run a butter knife or spatula around the edge and remove the ring. Allow to finish cooling, then serve.