Steak in Creamy Cajun Shrimp Sauce

ingredients

2 tablespoons oil
1 pound steak (such as strip loin, rib eye, etc.)
cajun seasoning to taste
2 tablespoons butter
8 ounces shrimp, peeled and deviened
4 cloves garlic, chopped
1/4 cup chicken broth (or dry white wine)
1 cup heavy cream
2 teaspoons dijon mustard
1 tablespoon cajun seasoning (or to taste)
1/4 cup parmigiano reggiano (parmesan
cheese), grated