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To prepare the blueberries: Place the berries in a microwave-safe bowl, and heat them for 4 to 5 minutes, till they're thawed and beginning to warm.
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Combine the berries with the remaining filling ingredients, and spoon the mixture into a lightly greased 8" round cake pan, 9" pie pan, or 9" round cake pan; if you use an 8" pan, be sure it's at least 2" deep.
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Bake the berries in a preheated 350°F oven for 30 minutes, until the berries are starting to bubble.
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Meanwhile, make the topping: Whisk together the dry ingredients.
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Add the melted butter and flavors, mixing till coarse crumbs form.
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Set the topping aside.
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Remove the berries from the oven, and spread/sprinkle the topping over the berries.
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Bake for an additional 45 minutes, until berries are bubbling and topping is beginning to brown.
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Remove from the oven, and allow to cool completely, preferably overnight.
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If you serve the crisp right away, it'll be very liquid; allowing it to set up overnight lets the berries reabsorb some of their juices.
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Next day, serve the crisp plain, or à la mode.
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Heat it briefly (about 30 seconds) in the microwave, if desired, to provide a nice warm bed for the ice cream!