Preheat oven to 375 degrees F (190 degrees C). Spray a ramekin or small baking dish with oil spray and set aside.
In a medium-sized bowl, whisk together the flour, sugar, baking powder, salt, cinnamon, nutmeg and cloves.
In a smaller bowl, mix together the pumpkin, melted butter, egg yolk and milk.
Pour the wet ingredients into the dry ingredients and stir until well blended.
Transfer to prepared baking dish and set aside.
In a small bowl, mix together streusel ingredients with a fork until crumbly.
Pour over pumpkin cake batter and spread evenly over the top.
Bake in the oven for 35-40 minutes or until toothpick inserted in the center comes out clean.
Remove from the oven and place on a baking rack to cool. Run a knife around the rim of the baking dish and remove coffee cake from the dish. Serve.