For streusel topping: • cereal with flakes (if it's got dried fruits and nuts, even better!) Granola and muesli work, too • butter, cut into 1/2" cubes • packed brown sugar (light or dark ok) • AP flour • kosher salt, depending on how much you like that sweet-salty contrast in your desserts • ground cinnamon • Berry filling: • lbs. berries, washed and drained. Most kinds can be left whole, strawberries should be halved/ quartered depending on size • flour or corn starch • sugar, depending on how tart your berries are and how sweet you want your filling • salt •