No flour, No Butter, No Oil! Blueberry Yogurt Cake with 5 ingredients!

✅400 g greek yogurt(1 1/2 cups)
✅4 eggs
✅2-3 tbsp sweetener(stevia/or your choice)
✅40 g corn starch( 1/4 cup)
✅70 g blueberries(2.5 oz)
⏲bake 45-50 minutes at 170°C/ 340°F
cover and refrigerate for 1 hour
baking form 16 cm