Flat iron steak with french onion mushroom sauce recipe

Ingredients

• 1 flat iron steak (or more)
• Salt and pepper
• 1 teaspoon canola or vegetable oil
• 1 (4 1/2 ounce) jar sliced mushrooms, drained
• 1 teaspoon minced garlic
• 1/2 cup prepared French onion dip
• 2 tablespoons half-and-half
• 1/2 teaspoon minced chives
• 1/4 teaspoon black pepper