Preheat oven to 350°F. In a medium saucepan, bring water to boiling. Stir in sweet potato, rice, and 1/2 teaspoon salt. Return to boiling; reduce heat. Simmer, covered, about 20 minutes or until liquid is absorbed.
Meanwhile, in a large bowl, combine black beans, soybeans, 1/2 cup of the cheese, the sour cream, chile peppers, green onions, flour, sage, garlic, and 1/2 teaspoon salt. Stir in rice mixture.
Transfer mixture to an ungreased 2-quart casserole. Sprinkle with the remaining 1/2 cup cheese. Bake, uncovered, about 30 minutes or until heated through. If desired, sprinkle each serving with pumpkin seeds.
This is very Yummy! Follow the recipe, you won't be disappointed.