Mix the shredded cabbage, grated carrots, diced bell peppers, minced garlic, and minced ginger together in a large bowl until well combined.
Add soy sauce, salt, and pepper to the vegetable mixture, then stir again to evenly distribute the seasonings.
Prepare the dough by gradually adding water to the wheat flour, kneading until a smooth, elastic dough forms. Cover and let rest for 15 minutes.
Divide the dough into small portions and roll each into thin, round wrappers about 3-4 inches in diameter.
Place a small spoonful of the vegetable filling in the center of a wrapper.
Fold the wrapper over the filling and pinch the edges together, sealing the momo tightly to prevent leaks.
Repeat the filling and sealing process with remaining wrappers and filling.
Place the momos in a steamer basket lined with cabbage leaves or lightly oiled parchment paper to prevent sticking.
Steam the momos over boiling water for about 12-15 minutes, until the wrappers turn glossy and slightly translucent.
Carefully remove the steamed momos from the steamer and serve hot with your favorite dipping sauce.