too many hot chilli peppers in my Italian Beef!
The only things that could really work without modifying the recipe:


pick out the peppers, if they're whole and not thoroughly cooked in
add a lot more beef, so it's diluted down to a reasonable heat level


Otherwise, a couple options, which can be combined:


add something creamy/fatty to cut the heat, e.g. sour cream, yogurt, coconut milk, or some kind of creamy sauce
add enough of something else to get to a reasonable heat level, e.g. make a stew, make sandwiches with other ingredients, make pasta or rice, put it in baked potatoes, etc.


See also: How can you make a sauce less spicy/hot? and How can I wash down spicy food?