Prepare a 12-cup muffin tin with paper liners or cooking spray. Set aside.
Next, whisk together the flour, baking powder, salt, sugar, and cinnamon in a large mixing bowl.
Add the rhubarb and strawberries and toss well to coat.
In a medium-sized mixing bowl, whisk together the milk, oil, and eggs.
Next, add the wet ingredients to the dry ingredients and mix until everything is wet.
Mix up the streusel topping by adding all the ingredients to a medium-sized mixing bowl. Mix with a fork until the butter is evenly distributed and crumbly.
Evenly scoop the batter into the prepared muffin tin and top each muffin with the streusel topping.
Bake at 350 degrees for about 20 minutes or until a toothpick inserted in a muffin comes out clean and the topping is slightly golden.
Enjoy!
Recipe by Real Life Dinner at https://reallifedinner.com/strawberry-rhubarb-muffins/