First of all, as you know you have to make this finger sub in the oven, so get your preheated at 375 degrees which is a good temperature for this recipe.

Line a baking sheet in the baking pan and bring your chicken fingers or nuggets near you. Put all these chicken fingers in the pan which is sprayed with cooking spray and put it in the oven.

Bake your chicken fingers in the oven for 12-15 minutes.

Bring the sub-buns and then use a knife or cutter to cut them in half. Now use butter to coat both halves with it.

Now bring the same baking dish and bake these butter-coated buns in the oven for a few minutes.

Bring the chicken fingers and stuff in the buns then put the cheese sliced over the chicken fingers.  Also, add tomatoes to it.

Bring the ranch dressing and spread it over the stuffing. Use ketchup in the same way if using it.

Now put these stuffed chicken subs again in the oven for 6 minutes so that the cheese will get bubbly and the flavors will merge with each other.

Serve your chicken finger subs while hot!