Preheat the oven to 375°F (190°C) and place your ramekins on a baking sheet for easy handling.
In a mixing bowl, combine the cranberries, orange zest, sugar, and cornstarch. Toss gently until the cranberries are evenly coated. The mixture should look vibrant and slightly thickened.
Spoon the cranberry-orange mixture into each ramekin, filling about three-quarters full to allow space for the topping.
In a separate bowl, combine the flour, oats, brown sugar, and cinnamon. Add the cold butter pieces and use your fingers or a pastry cutter to work the butter into the dry ingredients until the mixture resembles coarse crumbs.
Sprinkle the crumble topping evenly over each filled ramekin, pressing gently to ensure it adheres slightly and forms a nice crust.
Bake the crisps in the preheated oven until the topping is golden brown and the filling is bubbling around the edges, about 25 minutes. The aroma of cinnamon and baked fruit will fill the kitchen.
Remove the ramekins from the oven and let them cool slightly for a few minutes. The filling is hot and bubbly, and the topping is crisp and fragrant.
Serve the individual crisps warm, with a drizzle of cream or a scoop of vanilla ice cream if desired. Enjoy the bright, tart filling complemented by the crunchy, cinnamon-spiced topping.
