In a medium saucepan set over medium-low heat, melt sugar.

Cook, without stirring, until the sugar has turned a deep amber hue, approximately 10 to 12 minutes.

Then add butter while stirring constantly.

Slowly whisk in the cream and continue simmering the mixture until it is smooth

Remove from heat, then whisk in salt, to taste.

In a bowl, whisk together all the dry ingredients.

Pour in melted butter and vanilla, stir until moist and crumbly.

Set aside.

Preheat the oven to 175C.

Toss sliced apples with cinnamon powder, then set aside.

Line and grease a 8 inch round pan.

In a mixing bowl, cream butter, sugar, and vanilla extract together until light and fluffy.

Add egg and beat well.

Add sour cream and beat until combined.

Sift in dry ingredients (salt, baking powder, baking soda, and flour) to the butter mixture.

Stir until combined.

Spread half the batter at the bottom of the pan.

Lay the apple chunks evenly on top of the batter.

Sprinkle 1/2 of the crumbs mixture over the apples.

Spread the remaining batter over the crumbs and on the top spread the rest of the streusel.

Bake 35-40 minutes, or until a skewer inserted in the center comes out clean.

Drizzle salted caramel sauce on top and serve.