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Heat oven to 325 degrees and generously coat a 10-inch/12-cup Bundt cake pan with nonstick cooking spray.
Make the bananas Foster filling: Peel the bananas and cut them crosswise into 1/2-inch slices. Melt butter in a medium (10-inch) skillet over medium heat. Stir in the brown sugar and cinnamon, then add the sliced bananas. Cook, stirring occasionally, until a sugary syrup forms, 2 to 3 minutes.
Turn off the flame (or if using an electric stove, pull the skillet off the heat) and add the liquor, if using. Return pan to the heat and, if using a gas stove, slightly tilt the pan near the flame to flambé. (If using an electric stove, light the liquid with a long-reach lighter.) Let the flames die down, swirling the pan until the alcohol burns off. Reduce heat to low and stir briefly with a wooden spoon. (Alternatively, skip adding the alcohol, add buttermilk and cook sauce just until the liquid reduces slightly.) Strain liquid from bananas into a medium bowl to separate bananas and sauce; set both aside.
Make the cake: In a stand mixer or with a hand-held mixer on medium speed, cream together granulated sugar and butter until light and fluffy, about 4 to 5 minutes.
Sift the flour into a medium bowl. In a small bowl or liquid measuring cup, mix together the sour cream and buttermilk.
Once the butter is creamed, add 1 egg at a time and mix until each is fully incorporated, scraping down the sides of the bowl after each addition.
Add half the flour and mix on low speed until fully incorporated. With the mixer running, add the buttermilk mixture in a slow, steady stream and mix until fully incorporated. Add the remaining flour and mix.
Once fully combined, add the vanilla and mix to incorporate. By hand, fold in strained bananas.
Pour the batter into the prepared pan and smooth evenly. Bake for 65 to 80 minutes, until a toothpick or cake tester comes out clean.
While the cake cools, prepare the glaze: Sift the confectioners’ sugar into the bowl with the reserved banana sauce and whisk to combine. If the glaze is too thick, thin with water (or buttermilk), 1 tablespoon at a time, until it’s smooth, drizzles easily and coats the back of a wooden spoon.
Once cake has cooled, spoon the glaze over. Slice the cake and serve with ice cream or whipped cream and candied pralines, if desired.