3 sirloin steaks with mushroom sauce and chive garlic potatoes Recipes

boneless sirloin steaks, trimmed (about 1 inch thick ), black pepper, divided, salt, divided, olive oil, sliced cremini mushrooms, dry red wine, water, all-purpose flour, refrigerated mashed potatoes, chopped chives, garlic powder

olive oil, garlic cloves, minced, basil leaves, minced, salt, freshly cracked black pepper, angus boneless strip steaks , 10 oz each, idaho baking potatoes , 8 to 10 oz each, red potatoes , scrubbed and quartered, warm milk, sour cream, at room temperature, butter, at room temperature, freshly grated parmesan cheese, nutmeg , to taste, salt and pepper, butter, shiitake mushrooms, sliced, minced shallots, white wine, bourbon, heavy cream, beef stock, salt & freshly ground black pepper, sliced chives, for garnish