Zwetschgenkuchen (German Plum Cake) - Cooking Restored

Ingredients

• 1/2 cup salted butter, softened
• 3/4 cup sugar
• 2 eggs, room temperature
• 1 tsp vanilla extract
• 1/8 tsp salt
• 1 1/4 cup all-purpose flour
• 1 tsp baking powder
• 1 1/2 - 2 pounds of plum, pitted and sliced into sixths
• Crumble Topping -
• 1 cup flour
• 1 cup sugar
• 1/2 tsp cinnamon
• 1/2 cup unsalted butter, softened