1. Preheat the oven to 350°F (180°C). Lightly grease a loaf tin and line with baking parchment. Set aside.

2. Mix the flour for the streusel with the brown sugar and cinnamon in a bowl. Add the cold butter and mix in with a fork (or your fingers) until different sized streusel form. Place in the fridge until needed.

3. Add the eggs, oil, sour cream, oats milk, and maple syrup to a large bowl and mix until well combined. Mix the flour with ground almonds, sugar (or xylitol), baking powder, and salt in a separate bowl until well combined. Add to the large bowl and mix everything until well combined – do not overmix though. Pour half of the batter into the prepared loaf tin, sprinkle some of the streusels on top and cover them with the remaining batter. Sprinkle the remaining streusels over everything and bake for about 50-55 minutes or until a wooden skewer inserted into the center of the cake comes out clean. Take out of the oven and let cool down completely on a wire rack.