Preheat an oven at (170 degrees celsius / gas mark 3 / 338 Fahrenheit) then grease and line a baking tray or cake pan
Combine softened butter with the sugar until it is light and fluffy
Then add in the egg plus the vanilla and mix well
Sift in the dry ingredients and combine thoroughly
Now, mix in the sour cream and make sure everything is fully combinedTip: If the mixture is too dry or thick you can add a couple tbsp of milk Take about 4 tbsp of cake batter and add in the spices and coffee, mix until well combined
Mix together all of the crumble ingredients besides the pecans using a fork or food processor until you have a crumble like consistency
Now add in the chopped pecans and the crumble mix is ready
Place the plain cake batter into the tray or pan then layer on the spiced mix and swirl the two together and sprinkle on the crumble mixture evenly
Bake for 45 - 60 minutes until a toothpick comes out mostly clean and it is golden and slightly coming away from the edgesTip: Turn the tray or pan a couple of times to cook the cake evenly Once baked take the cake out of the oven onto a cooling rack and let it cool completely
Combine all of the glaze ingredients until smooth and at a ribbon stage
Pour the glaze over the cake in a zig-zag pattern and let the glaze set before cutting