Spanish Manzanilla Olive Croquetas

Ingredients

• 2 tablespoons olive oil, plus extra for deep-frying
• 4 tablespoons unsalted butter
• 3 tablespoons all-purpose flour
• 1 1/2 cups whole milk, heated
• 3 ounces Spanish Manzanilla olives, chopped
• Salt
• 2 eggs
• 1 cup fine dried bread crumbs