Preheat the oven to 175 degrees Celsius.
Line and grease a 16-18 cm spring form.
Whisk together eggs and monk fruit sweeteners until the mixture turns pale and fluffy.
Add fiber syrup, mashed banana, applesauce, Greek yogurt and stir to combine.
Combine oat flour, rice flour, potato starch, cinnamon, baking soda, baking powder and salt in a separate bowl. Sift into the wet ingredients and stir just until incorporated.
In a separate bowl add the cream cheese, yogurt and monk fruit sweetener. Mix using a hand mixer until combined. Add the egg and mix again, just until the egg is incorporated.
Pour about 2/3 of the cake batter into the prepared spring form.
Add the cream cheese filling, gently spread into an even layer.
Dollop the plum jam evenly over the cream cheese filling, gently swirl into the cream cheese filling.
Add remaining cake batter to the spring form and spread into an even layer.
Sprinkle the streusel over the cake.
Bake in the oven for 40-50 minutes, or until an inserted toothpick comes out clean.
Remove from the oven and let it cool for 20 minutes. Run a knife around the edges to release the cake. Then let it cool completely, preferably over night to make sure the cream cheese filling sets well.