Muffins are the easiest thing to make when you're new to gluten free. Make the same recipes over and over trying different gluten free flour blends until you know what you like. I use my homemade blend for these muffins and you can find the recipe for it in the notes below.
In a large bowl combine flour, rhubarb, sugar, baking soda, cinnamon, salt and xanthan gum. Stir to combine.
WET INGREDIENTS
In a 2-cup measuring cup combine yogurt, oil and egg. Add to dry ingredients and stir to combine.
Use a portion scoop to fill 12 paper-lined muffin tins.
STREUSEL TOPPING
In a small bowl combine sugar, walnuts, cinnamon and butter. Stir with a fork until well combined. Top each muffin with a spoonful of streusel topping.
Bake muffins in preheated oven for 25-30 minutes until browned around the edges.
Cool on baking rack for 2 minutes then remove muffins from pan and cool completely. Store in airtight container or freeze.