Preheat the oven to 350°F and generously butter and flour a 9" bundt pan. I recommend using 2 tablespoons unsalted butter that is softened to room temperature. Use your fingers to work the butter into the grooves of the pan. It's important to make sure you coat every bit of the pan to ensure the cake releases nicely so it looks purty. Sprinkle with flour and distribute evenly throughout the pan. Discard any excess flour.
Combine 2½ cups all-purpose flour with 1 teaspoon baking powder and ¾ teaspoon salt. Whisk to mix well and set aside.
Place 12 ounces fresh cranberries (1 bag) in a small bowl and pick through them to weed out any mushy ones. Add 1 tablespoon all-purpose flour and toss gently to coat the cranberries. Set aside until ready to use.
In a mixing bowl, combine 2 sticks softened butter with 2 cups sugar. Mix on low to combine and then turn up the speed to mid-high and beat for 2 minutes until light and fluffy. Mix in 1 teaspoon vanilla extract.
Add eggs to the butter mixture one at a time, mixing after each addition until combined. Mix in ½ the flour mixture until combined and add ½ cup sour cream and mix well. Add in the remaining flour mixture until just combined and scrape down the sides of the bowl to ensure all flour is mixed in. Gently fold cranberries into the batter.
Spoon the batter into the prepared pan and smooth to even out.
Bake on the center rack of the preheated oven for 50-55 minutes until the top springs back when pressed gently or a cake tester inserted comes out clean. Remove from oven and allow to cool in pan for 15 minutes.
Carefully run a flat edge, such as a butter knife, around the edge of the pan to loosen and also around the center hole. Place a cooling rack over top of the cake pan and carefully flip the cake pan over so the cake slides out onto the cooling rack. The cake pan will be hot, so be sure to protect your hands.
Allow cake to cool completely. Prepare the sweet orange glaze by combining 1 cup confectioners’' sugar with ¼ cup orange juice and a pinch of salt. Mix well to combine. Add more sugar to thicken or more orange juice too thin to your desired consistency. When cake is cooled, drizzle the glaze over the cake. Garnish with fresh cranberries and enjoy!