Slow Cooker Blueberry Plum Cobbler - Blueberries

Ingredients

• 2 tbsp unsalted butter, at room temperature
• 3 cups fresh or frozen blueberries
• 3 cups sliced plums
• 1/2 cup brown sugar
• 1/4 cup cornstarch
• 2 tsp orange zest
• 2 tbsp orange juice
• 1/2 tsp ground cinnamon
• 1/4 tsp ground nutmeg
• 1 cup all-purpose flour
• 2 tbsp granulated sugar
• 2 tsp baking powder
• 1/4 tsp ground cinnamon
• Pinch of salt
• 2 tbsp cold unsalted butter, cut into cubes
• 1 egg
• 1/4 cup milk
• 1 tsp vanilla extract