Preheat the oven to 400 degrees and line a muffin tin with paper liners
In a large bowl whisk together the flour, sugar, baking powder, salt, and cinnamon. Add in the rhubarb and toss to coat well.
In a large measuring cup, first add the milk, then the vegetable oil and end with the vanilla and egg. Whisk to combine.
Add the wet ingredients to the dry and mix just to combine well, yet do not over mix the batter
Divide the batter evenly into the 12 paper liners, about 2/3 of the way full
In a small bowl, mix the ingredients for the streusel and then divide evenly on top of the batter already in the paper liners.
Bake for 18-20 or until the streusel topping starts to brown. Text that the insides of the muffins are cooked using a toothpick and remove from oven if toothpick comes out clean.
Enjoy!
Notes
- Streusel topping is optional
- Store in an airtight container for 2 days, or 3-4 in the fridge. Also freeze well for later