Upside down Apple & Dates Cake On Stove Top!

I made this beautiful upside-down cake in a pan, on the stovetop, using 1 apple, 1 egg, and dates. It also has simple caramel sauce too! Came out so delicious it finished in no time.
It is simple to make but has some tricks. I will try to give you all the details to have the best result.
Ingredients For Apple, Dates & Walnuts Upside Down Cake on Pan:
For 22cm nonstick pan size
For the cake batter
1 egg
1/4 cup or 3-4 tbsp sugar
1/4 cup milk
3 tbsp plain yogurt (if you don't have yogurt use 1/4 more milk)
1/4 cup or 3-4 tbsp olive oil or vegetable oil
1/2 cup plus 1 tbsp flour (Add the 1 tbsp at the end if needed for thick smooth batter consistency)
1 heaped tbsp corn or wheat starch (optional, you can use same amount flour too)
1 tsp baking powder
1 tsp vanilla powder
pinch of baking soda
For the topping:
1 apple
5-7 dates (I used soft Iranian Dated) (You can use 2 apples instead)
handful of walnuts
For the simple caramel sauce
1 tbsp butter
1 tbsp sugar

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