Prepare the pan: Preheat the oven to 350°F (175°C). Grease and flour a 10- to 12-cup Bundt pan.
Mix dry ingredients: Whisk the flour, baking powder, and salt in a medium bowl.
Cream butter and sugar: Beat the softened butter and sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract and orange zest.
Combine the batter: Add the sour cream and orange juice alternately with the dry ingredients, beginning and ending with the flour mixture. Mix just until combined.
Add cranberries: Toss the cranberries with 1 tablespoon of flour and gently fold them into the batter.
Fill the pan: Pour the batter into the prepared Bundt pan and smooth the top.
Bake: Bake for 45–60 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
Cool the cake: Let the cake rest in the pan for 15–20 minutes. Carefully invert it onto a wire rack and cool completely.
Make the frosting: Beat the cream cheese and butter until smooth. Add the powdered sugar and vanilla extract. Mix in milk or orange juice gradually until the frosting reaches a drizzleable consistency.
Decorate and serve: Drizzle the frosting over the cooled cake. Garnish with orange zest or cranberries, slice, and serve.