Preheat the oven to 350 degrees F. Spray an 8 by 4 loaf pan with cooking spray and set aside.
In a medium bowl, whisk together flour, baking soda, salt, cinnamon, and all spice. Set aside.
In the bowl of a stand mixer, add the eggs and beat on medium speed for about 30 seconds. Add in canola oil, applesauce, and vanilla. Mix until combined. Add sugars and beat until smooth.
Slowly add in the flour mixture and mix on low speed until just combined. Gently fold in rhubarb and apple chunks. Pour batter into prepared loaf pan.
In a small bowl, mix together cinnamon and sugar. Sprinkle evenly over the batter. Bake for 50-55 minutes, or until loaf is golden and a toothpick comes out clean.
Cool bread in pan for 10 minutes. Loosen sides and remove from pan. Cool completely on a wire rack before slicing.