Croquetas de Jamón Serrano Recipe - Traditional Spanish Ham Croquettes

Name: Croquetas de Jamón Serrano Recipe - Traditional Spanish Ham Croquettes
Prep time: 30 min
Cook time: 15 min
Total time: 45 min
Cuisine: Spanish
Ingredients: 4 tbsp unsalted butter; ¼ cup extra virgin olive oil; 1 scant cup all-purpose flour; 1 medium onion (very finely diced); 4 cups whole milk (at room temperature); 1 pinch nutmeg; 8 ounces Serrano ham (finely diced); 2 beaten eggs; flour (for breading); breadcrumbs (for breading)