Mix apples, berries, sugar, flour, cinnamon and lemon juice. If using frozen apples, thaw just until pieces can be separated.
Pour into a 9 x 13 “(23 x 25 cm) baking dish.
Top with butter pieces.
Pour lemon juice into a measuring cup, add milk. Allow to rest for 3 to 5 minutes until milk thickens. Or, substitute milk and lemon juice with buttermilk.
Mix flour, baking powder and sugar in a bowl.
Cut in butter with a pastry blender or two knives until crumbly.
Add milk mixture. Stir with a fork just until dough comes together.
Drop by spoonfuls onto apples and berries.
Bake for 45 minutes or top is golden brown.
Allow to cool for 15-30 minutes before serving to allow filling to set.
Recipe by Fruit Share at https://www.fruitshare.ca/home-2/tips-tricks-harvesting-fruit/recipes-preserves/apples/apple-and-berry-cobbler/