Cut the chicken breast and tofu into bite-sized pieces.
Chop the onion and green onion.
Heat cooking oil in a pan and stir-fry the chicken breast.
When the chicken is half-cooked, add the chopped onion and stir-fry.
Add the tofu and lightly stir-fry together.
Prepare the sauce by mixing soy sauce, gochujang, water, minced garlic, and oligosaccharide syrup.
Pour the sauce into the pan and simmer with all the ingredients.
When the sauce thickens, add the green onion and sesame oil to finish.
Serve the braised mixture over warm rice.