PREHEAT THE OVEN TO 355 F (180C).
IN A LARGE BOWL, MIX THE SOUR CREAM, WHIPPING CREAM, EGGS AND VANILLA EXTRACT.
SLOWLY ADD THE DRY INGREDIENTS INTO THE WET INGREDIENTS, MIXING THOROUGHLY.
USING A DONUT PAN (OR USING A MUFFIN TIN WITH SCRUNCHED UP BAKING PAPER IN THE MIDDLE), SLOWLY POUR ENOUGH OF THE BATTER TO ¾ FILL THE MOULD, AND PLACE IN THE OVEN FOR 10-15 MINS OR UNTIL FIRM TO TOUCH ON THE OUTSIDE.
REMOVE THE DONUTS AND LET COOL.
FILL A FRYING PAN WITH THE COCONUT OIL, HEAT UP THE PAN AND FRY EACH DONUT FOR APPROXIMATELY 2 MINS EACH SIDE OR UNTIL GOLDEN BROWN.
PLACE THE NATVIA AND CINNAMON TOGETHER ON A PLATE, AND ROLL THE DONUTS IN THE MIXTURE.
ENJOY.