Blackberry Cobbler

Ingredients

• 4 cups blackberries, rinsed clean
• 1/2 cup sugar (less or more to taste, depends on how sweet the berries are and how sweet you would like your cobbler to be)
• 1 teaspoon lemon zest
• 1 tbsp lemon juice
• 1/4 teaspoon cinnamon
• 1 1/2 tbsp cornstarch (for thickening, can use instant tapioca instead)
• 3 tbsp sugar
• 1 cup all purpose flour
• 1 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 4 tbsp butter
• 1/4 cup milk
• 1 egg, lightly beaten