Preheat your oven to 450°F / 232°C. 2. Prepare the plantains: Trim the ends, then peel and discard the skins.
Slice the plantains on a diagonal into ½-inch thick pieces. 3.
In a small bowl, whisk together the ground cinnamon, ground cumin, and grated nutmeg. 4. Lightly spray a large baking sheet with cooking spray.
Arrange the plantain slices in a single, even layer, using two sheets if necessary to avoid overcrowding. 5. Spray the tops of the plantains and sprinkle evenly with the spice mixture. 6.
Bake for 8 minutes, or until the bottoms are golden brown. 7. Carefully flip the slices with a metal spatula and continue baking for another 4 to 6 minutes, until both sides are beautifully golden and caramelized. 8.
Remove from the oven and serve immediately while warm.
Keep a close eye on the plantains as they bake; the natural sugars can cause them to go from golden to burned very quickly.