Creamy Chicken, Asparagus and Pancetta Penne

2 tablespoons all-purpose flour
2 tablespoons butter, softened
1 T. butter
1 T. + 1 teaspoon olive oil
2 ounces chopped pancetta
1 (8-ounce) package sliced cremini mushrooms
1/4 cup white wine or 2 tablespoons each lemon juice and water
1 teaspoon salt, divided
4 cups unsalted chicken stock
3 cups 1% low-fat milk, divided
12 ounces uncooked whole-wheat penne (such as Barilla)
1 bay leaf
1 lb boneless chicken breasts
1 cup frozen green peas
12 ounces asparagus, trimmed and cut into 2-inch pieces
1 tablespoon chopped fresh thyme
3 tablespoons chopped fresh parsley
1 teaspoon grated lemon rind
3/4 teaspoon black pepper 

1. Combine flour and softened butter in a bowl until a paste forms.

2. In a small saute pan add 1 T. olive oil and 1 T. butter.  Saute chicken until cooked through.  Set aside.

3. Place a large high-sided sauté pan over medium-high heat. Add oil to pan; swirl to coat. Add pancetta; cook 2 minutes, stirring frequently. Add mushrooms; sauté 5 minutes or until browned and liquid evaporates. Add wine; cook 2 minutes or until liquid is absorbed, stirring to loosen browned bits. Stir in 1/4 teaspoon salt. Transfer mixture to a plate.

4. Add stock, 2 cups milk, penne, and bay leaf to pan; bring to a boil. Cook 8 minutes, stirring occasionally. Stir in peas, asparagus, chicken and 1/2 teaspoon salt; cook 2 minutes, stirring frequently. Stir in remaining 1/4 teaspoon salt, remaining 1 cup milk, and thyme; cook 2 minutes. Add butter-flour paste, in pieces, stirring constantly to combine and thicken. Remove from heat; stir in mushroom mixture, parsley, rind, and black pepper.