Penne with Chicken and Gruyère Cheese Sauce

Ingredients

• • 3/4 lb (375 g) penne
  • 1 lb (454 g) skinless and boneless chicken thighs, finely chopped
  • 1 onion, chopped
  • 2 tablespoons (30 ml) butter
  • 1 tablespoon (15 ml) olive oil
  • 2 cloves garlic, finely chopped
  • 2 tablespoons (30 ml) flour
  • 2 cups (500 ml) milk
  • 3/4 cup (180 ml) frozen peas
  • 1 cup (250 ml) grated Gruyère cheese
  • 1/4 teaspoon (1 ml) ground nutmeg
  • 3 tablespoons (45 ml) chopped fresh chives
  • Salt and pepper