Oatmeal Blueberry Crumb Cake

Ingredients

• 1/2 teaspoon salt
• 3/4 stick butter, room temperature - not super soft
• 1/3 cup sour cream
• 1 teaspoon baking soda
• 1 teaspoon vanilla
• 3/4 cup coconut sugar
• 1 1/4 cup oat flour
• 1 teaspoon cinnamon
• 1 1/2 cups fresh blueberries
• 1 cup oat flour
• 1/2 cup coconut sugar
• 2 eggs
• 4 Tablespoon butter
• 1/4 teaspoon baking powder