• Preheat the oven to 350ºF. Prepare a 9x5 loaf pan by greasing and flouring it, then line the bottom with parchment.

To make the cake

• In a small saucepan, brown the butter until the milk solids turn golden brown at the bottom of the pan and you can smell a nutty aroma. Set aside to cool.
• In a large bowl, combine the flour, baking powder, cinnamon and salt.
• In a separate bowl, whisk together the dark brown sugar with the eggs, then add in the apple butter, brandy and vanilla.
• Pour the wet ingredients over the dry ingredients, and stir to just combine, then add the browned butter and stir to incorporate. Finally, carefully mix in the chopped apple.
• Pour the batter into the prepared pan and set aside.

To make the streusel topping

• In a medium bowl, combine the flour, oats, brown sugar, nuts and salt.
• Drop in the butter and work it in with your palms until the mixture resembles a coarse crumble.
• Sprinkle the streusel topping evenly over the loaf.
• Bake the loaf for about 65 minutes, until a cake tester inserted through the centre (not through the fruit if you can avoid them!) comes out clean.
• Let the loaf cool 10 minutes, then unmold onto a wire rack to cool completely before cutting.