chilli powder is a combination of dried and ground red bell pepper with other additives like herbs and spices which vary depending on the manufacturer
Red chili powder can be made from a combination of spices or not. It is really a generic term that is not precise.
You could make the seasoning mixture per the recipe, then add 1/8 to 1/4 teaspoon of the mixture to your chili and store the remainder for later use. Or your could add a little of this, a little of that, until you have the taste and heat just right.
For your quick pot of chili, exclude adding the flour and the minced dried onion. The following is a suggestion for seasoning your chili.
1/4 teaspoon chili powder
1/8 teaspoon cayenne pepper
1/8 teaspoon of ground cumin
1 pinch crushed red pepper flakes
1/8 teaspoon of garlic powder (not garlic salt)
1/8 teaspoon of salt
1/8 teaspoon of sugar
Having cooked for many years, tend to season foods without measuring the spices, knowing at a glance what is enough. Often make a vegetarian chili, putting cooked chicken in the mixture. For me, adding a can (11 ounce to 15 ounce) of drained yellow corn as mentioned in the included recipe gives the chili a natural sweetness along with texture.