This strawberry rhubarb coffee cake is a perfect breakfast or brunch treat. It's moist, tender, and packed with the flavors of fresh strawberries and tangy rhubarb. To make the cake, you'll need flour, sugar, baking powder, salt, butter, eggs, milk, vanilla extract, fresh strawberries, and fresh rhubarb. For the streusel topping, you'll need flour, brown sugar, cinnamon, and butter. Simply mix the dry ingredients together, then add the wet ingredients and mix until smooth. Fold in the chopped strawberries and rhubarb, then pour the batter into a greased baking dish. Sprinkle the streusel topping over the batter, then bake in a preheated oven for 35-40 minutes, or until a toothpick inserted into the center of the cake comes out clean. Let the cake cool for a few minutes before slicing and serving. This cake is perfect with a cup of coffee or tea.