Preheat the oven to 350°F (175°C). Grease and flour a 12-cup Bundt pan (2.8 L).
In a small bowl, whisk the flour, 1 tablespoon cinnamon (8 g), baking powder, baking soda, and salt. Set aside.
2½ cups (312 g) all-purpose flour, 1 tbsp (8 g) + 1 tsp (3 g) ground cinnamon, 2 tsps (8 g) baking powder, ½ tsp (2.5 g) baking soda, 1 tsp (6 g) table salt
Melt the butter in a medium saucepan over low heat. Remove from heat and let cool slightly, about 10 minutes. Whisk in 1 ½ cups brown sugar (330 g) until smooth, then whisk in the eggs.
1 cup (227 g) unsalted butter, 2 cups (440 g) light brown sugar, 4 large eggs
Fold the flour mixture into the butter mixture until just combined. Do not overmix. Gently fold in the apples.
4 medium-sized (~ 500 g) Granny Smith apples
Spoon half of the batter into the prepared pan. In a small bowl, mix the remaining ½ cup brown sugar (110 g) with 1 teaspoon cinnamon (3 g). Sprinkle this over the batter. Top with the remaining batter and smooth the surface.
Bake for about 50 minutes, or until a toothpick inserted in the center comes out clean.
Cool the cake in the pan for 30 minutes, then invert onto a cooling rack. Cool completely. Dust with confectioners’ sugar before serving.
confectioners' sugar