Stuffed flank steak recipe

This amazing recipe I founded at and I love it. It's so delicious and yummy. I hope you enjoy in it. 

flank steak (1 1/2 to 2 pounds)
1   package 
frozen chopped spinach, thawed
1/2  cup 
crumbled blue cheese
1   jar 
(7 ounces) roasted red peppers, drained and chopped
2   tablespoons 
seasoned dry bread crumbs
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egg yolk
3/4  teaspoon 
garlic salt
3/4  teaspoon 
ground black pepper
1   tablespoon 
olive oil