Rinse tofu noodles under running water.
Cut onion, bell pepper, and carrot into bite-sized pieces.
Heat cooking oil in a pan, then stir-fry onion, bell pepper, and carrot.
Once the vegetables soften, add tofu noodles and stir-fry together.
Season with soy sauce, minced garlic, pepper, and salt.
Mix well and continue to stir-fry on low heat for 2-3 more minutes.
Arrange the cooked tofu noodles on a plate.