Slice the onion, bell pepper, and garlic.
Boil the spaghetti in salted water.
Heat olive oil in a pan and sauté the garlic, onion, and bell pepper.
Add bacon and stir-fry together.
Add the cooked pasta noodles to the pan and mix with the ingredients.
Add tomato sauce and sriracha sauce, and toss well.
Season with salt and pepper to taste.
Serve on a plate and finish with parsley.