In a large bowl, cream together oil, butter, and sugar until lighter in color.
Add egg and vanilla extract and mix again.
Add all dry ingredients including cinnamon and mix until just combined.
For the streusel topping, mix together flour, brown sugar, cinnamon, and melted butter until crumbly.
Use a large cookie scoop to scoop out dough and make an indent with the scoop.
Add streusel topping to the indent and bake for 12-15 minutes or until lightly golden brown.
While the cookies cool, make the icing by mixing powdered sugar, milk, and vanilla extract until smooth.
Wait until the cookies are mostly cooled before adding the icing.
Enjoy your Gilmore Girls Coffee Cake Cookies!
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