Sourdough Discard Coffee Cake

This morning I wanted to make a coffee cake and thought it would be fun to add some sourdough discard to the mix and see how it turned out.  
 
Whenever I look for a specific sourdough recipe on the internet, I get dozens of complex results and very quickly feel overwhelmed.  

Something as simple as a coffee cake should not involve that much work.  
 
When my children were growing up, I would frequently make something special for breakfast on the weekend.  Usually, quick bread, muffins or coffee cake.  It was a great way to start our day and it is one of my favorite memories of being at home with my family. 
 

Sourdough Coffee Cake

 
Cake:
1/4 cup sourdough starter discard
2 Tablespoons butter, melted
1 egg, beaten
2 Tablespoons milk
1/4 teaspoon vanilla
1/2 cup all-purpose flour
1/4 cup sugar
1/8 teaspoon salt
1/2 teaspoon baking powder
 
 Topping:
 1 teaspoon cinnamon
 1/2 cup sugar
 2 tablespoons butter
 1 tablespoon flour

Instructions:
 
Preheat oven to 350 degrees
Combine sourdough discard, butter, egg, milk and vanilla
Add flour, sugar, salt and baking powder to sourdough mixture 
Mix until smooth
Pour into greased and floured 9-inch round pie dish or 8x8 square pan
Crumble topping ingredients together and sprinkle over cake batter
Bake for 30 – 35 minutes until toothpick inserted comes out clean