Step 1

Preheat oven to 350F and line a 12 cup muffin tin with muffin tin liners.

Step 2

Make the streusel first: combine the ingredients and rub together with your fingers until the butter is incorporated and the mixture has a dry crumbly texture. Set aside.

Step 3

In a large mixing bowl, whisk together the oil, sugar, eggs, milk, and vanilla extract.

Step 4

Next, whisk in the baking powder, baking soda and salt, making sure to mix well to get it evenly incorporated.

Step 5

Whisk in the flour, and then gently fold in the chopped rhubarb.

Step 6

Divide the batter evenly between the 12 muffin cups, and sprinkle streusel evenly over the top of the muffins.

Step 7

Bake for 23-25 minutes.

Step 8

Serve warm with butter!