Mardi Gras King Cake - #InTheKitchenWithKat

INGREDIENTS
Food color – green, gold/yellow, purple
1 ¾ cups pure cane sugar, divided
½ cup dark brown sugar
3 ½ cups + 4 tablespoons all-purpose flour, divided
2 ¼ teaspoons active dry yeast
1/2 cup buttermilk
1/2 cup sour cream
1 1/8 teaspoons salt, divided
2 eggs, room temperature
1 teaspoon vanilla butternut flavoring
1 ½ sticks salted butter, divided
1 ½ teaspoons ground cinnamon
2 cups powdered (confectioners sugar)
6 tablespoons French vanilla coffee creamer