On the same skillet cook diced onion and bell peppers until tender. Set aside with steak.
Again the same skillet place a tablespoon of butter and cook sliced french baguette pieces on both sides until crispy. Repeat as needed until you have grilled all your sliced french bread.
In a large pan place cream cheese, mayonnaise, and provolone cheese. Melt together (on low) well whisking the entire time. Add cooked steak and sautéed veggies to your dip.
Make sure to mix well until everything is melted and well combined. Once mixed drain any fat or oil released from cooked mayonnaise.
I have used different cuts of steak for this recipe and found a thin steak like a flank or strip steak works best.
Some mayonnaise that is oil based will let out some oil so when cooking you might need to drain it.