Stir together 2 tablespoons of vegetable oil, 1/2 tsp of cumin, 1/4 tsp of ground coriander, 1/4 tsp of salt, 1/4 tsp of cayenne pepper in a large bowl. Add sweet potatoes, bell peppers, and chick peas to the bowl and toss to coat the vegetables with the seasonings. Transfer veggies to the sheetpan.