Cut sausages into bite-sized pieces.
Slice onion and bell pepper thinly.
Heat oil in a pan and stir-fry the sausages.
Add the onion and bell pepper, and stir-fry together.
Mix gochujang, soy sauce, and oligosaccharide to make the seasoning.
Add the seasoning to the stir-fried ingredients and mix well.
Top the rice with the stir-fried sausages and vegetables.