Preheat the oven to 350°F.
Place the flour, baking powder and kosher salt in a medium-sized bowl and whisk to combine. Crack the eggs into a small bowl.
Place the Clementine mandarins in the food processor and with the metal blade, process the oranges until they are broken down in a pulp and the peel is in small pieces. If there are any large pieces of peel, scrape down the sides of the food process and continue to process the oranges until they are completely broken down.
Scrape the clementine puree into a 2-cup measuring. You should have 1-1/2 cups of puree. If you have less you may need to process another clementine. If you have more than 1-1/2 cups remove some of the puree. Add the sour cream to the puree and whisk together. You should have a total of 2 cups.
In a stand mixer with a paddle attachment cream the butter and sugar together for 4 minutes. The mixture should be lighter in color and look creamy. Add the eggs one at a time beating on medium speed after each addition until the egg is fully incorporated. Scrape the sides and bottom of the bowl after adding and beating in the second egg. After all the eggs are added scrape the sides and bottom of the bowl once again.
Add 1/3 of the flour and mix on low-speed (speed 2 on KitchenAid 7-QT Mixer) until incorporated. There may be some flour on the sides of the bowl - that’s okay. Add half of the clementine-sour cream mixer and mix on low speed until incorporated. Add 1/2 of the remaining flour, mix on low-speed, add the remaining clementine-sour cream mixture, and end with the addition of the remaining flour. After mixing in the remaining flour, scrape the sides and bottom of the bowl and mix for 20 seconds to fully incorporate all the ingredients.
Spray the bundt pan with Baker’s Joy baking spray making sure to cover the entire surface. Add the batter to the pan in large spoonfuls. When about half the batter is added tap the pan against a cloth covered counter 3 times to settle the batter into the pan. Add the remaining batter and tap the pan again to settle the batter into the crevices, especially if you’re using a bundt pan with an intricate pattern. If using the Nordic Ware Anniversary Bundt Pan there is no need to tap the pan.
Bake the cake for 55-60 minutes until the cake temperature is 202°F in the center and the top of the cake is slightly firm and bounces back when you press it with a finger tip.
Remove the cake from the oven and place it on a cooling rack. Let it cool for 15 minutes. Cover the cooling rack with a piece of parchment paper and then invert the cake onto the parchment covered cooling rack.
Let the cake cool completely, 1-1/2 to 2 hours, before adding the glaze.