Preheat the oven to 190ºc/170ºc fan and grab 12 tulip cases in a 12 hole muffin tray.
Mix the crumb ingredients together in a bowl, and chill in the fridge of freezer.
Add the oil, eggs, carrot and sugar to a bowl and combine.
Add the flour, spices and bicarb and mix again - try not to over mix.
Split the muffin mix between 12 tulip cases evenly.
Mix the chilled crumb up with a fork and sprinkle over the muffins.
Bake in the oven for 22-25 minutes and then cool.
Mix the drizzle ingredients together until thick and then drizzle over the muffins.
