Best Peach Blackberry Crumble with Oatmeal Pecan Topping Recipe

Ingredients

• 5 large peaches (about 5 cups), sliced (skin on)
• 2 pints fresh blackberries
• ¼ cup flour
• 1 teaspoon cornstarch
• 1 teaspoon pure vanilla extract
• ¼ cup sugar
• 1 teaspoon lemon zest
• 1 tablespoon lemon juice
• 1 cup all-purpose flour
• ½ cup Old Fashioned oats
• 6 tablespoons brown sugar
• ½ teaspoon salt
• ½ teaspoon cinnamon
• 1 stick (1/2 cup) unsalted butter, cut into small pieces
• ½ cup chopped pecans