Funfetti Bundt Cake

===INGREDIENTS===
====FUNFETTI CAKE:====
*2 1/2 cups cake flour, sifted
*1 teaspoon baking powder
*1 teaspoon baking soda
*1/2 teaspoon salt
*1 1/4 cups granulated white sugar
*1 cup (2 sticks) unsalted butter, softened
*1/4 cup vegetable oil
*2 large eggs, at room temperature
*1 tablespoon vanilla extract
*1 cup buttermilk
*2 large egg whites, at room temperature
*1/2 cup rainbow sprinkles (see Recipe Notes below)
*additional sprinkles for topping
====WHITE CHOCOLATE GLAZE:====
*8 ounces white chocolate, chopped
*1/3 cup half and half cream
*1/8 teaspoon salt
*1 to 1 1/2 cups powdered sugar, sifted
===INSTRUCTIONS===
====MAKE THE CAKE:====
*Preheat the oven to 350 degrees F.,  Spray a 10 to 12 cup bundt pan with nonstick spray.
*In a medium bowl, whisk together flour, baking powder, baking soda and salt.
*In a large bowl, use an electric mixer to combine the sugar, butter and oil at medium speed for 4 minutes or until light and fluffy.  Beat in whole eggs, one at a time.  Beat in the vanilla.  
*At low speed, beat in the flour mixture and buttermilk, making three additions of flour and two of buttermilk, and beating until incorporated.
*In another medium glass or stainless steel bowl, using the handheld mixer and clean beaters, beat the egg whites on medium-low speed until foamy.  Gradually increase to high speed and beat until firm peaks form.
*Using a spatula, carefully fold whites into batter in two additions. Fold in the sprinkles (see Recipe Notes below).  Transfer the batter to the prepared pan and smooth the top.
*Bake in a preheated oven for 45 to 55 minutes or until a tester inserted in the center comes out clean.  Let cool in pan for 10 minutes, then carefully invert the cake onto a wire rack to cool completely.
====PREPARE THE GLAZE:====
*In a small saucepan, stir together the white chocolate, cream and salt over medium-low heat until melted and smooth.  Whisk in 1 cup of the sugar.  Whisk in more sugar, if necessary, 2 tablespoons at a time, until the glaze is thick but pourable.
*Pour the glaze over the cooled cake, letting it drip down the sides.  Decorate with plenty more sprinkles.  Let the glaze set for at least 20 minutes before serving.