This is a recipe I grew up eating: my Mennonite Mom’s platz. It is a thin coffee cake with fruit and streusel on top. Sometimes on the second day the cake layer would get a bit dried out, but I didn’t mind too much because the fruit and streusel were so yummy. For this recipe I used a combination of rhubarb and apricots, but plums are another favourite.
Even though the photos show a thick round cake, I grew up with it baked thinly in rectangular form, which was cut into squares.
What you need for the cake:
1/2 cup butter (the original recipe called for crisco or margarine)
1/2 cup sugar
2 cups all-purpose flour
3 teaspoons baking powder
1/2 teaspoon salt
1 egg
about 1/2 cup milk
2-3 cups chopped fruit of your choice
What you need for the streusel:
1/4 cup melted butter
1 cup sugar
3/4 cup flour
pinch salt
splash of vanilla
What you do:
1. Preheat the oven to 35oF.
2. To make the cake, cream the 1/2 cup butter and 1/2 cup sugar well.
3. Combine the flour, baking powder and salt.
4. Crack the egg into a measuring cup and mix it up a little with a fork. Add enough milk to the measuring cup so it reaches the 2/3 cup mark.
5. Mix in some of the liquid and alternate with the dry ingredients. Spread this mixture in the bottom of a buttered 9 x 13 inch pan.
6. Spread the fruit on top of the batter.
7. To make the streusel topping just combine all the ingredients; my mom says to do it with a whisk, but I just used a fork and then mixed it with my hands, and then sprinkled it on the cake with my hands.
8. Bake for 35-40 minutes.
Trust in Kim (she will guide thee) 
Looks amazing! Great post!