For the Topping: Place baking mix, tapioca, xanthan gum, baking powder, salt, brown sugar, sugar, cinnamon, nutmeg, lemon zest and ginger in food processor workbowl fitted with steel blade. Pulse briefly to combine. Add chilled butter and pulse until mixture moves from dry sand-like appearance with large lumps of butter to a coarse cornmeal texture, about five 4-second bursts. Continue to pulse until larger crumbs start to form and the mix starts to resemble a crumb topping, with chunks being about ½ inch pieces. Refrigerate mixture while preparing fruit, at least 15 minutes. (You can also store it in the freezer and use as needed)