For the chicken, preheat the oven to 400°F. Place Chicken Breasts between layers of plastic wrap and flatten to about 1/4” thickness. Season well with salt and pepper. In a small saucepan over medium-high heat, sauté chopped onion, mushrooms and Spinach. Add a little butter for a creamy consistency. Mixture should be thick to stuff the chicken. Put aside. In same saucepan, sauté Shrimp in 1 Tbs. Olive Oil, chopped onion, add oyster sauce, fish stock and cream. Leave to simmer. That is the sauce for our chicken. Roll up Chicken Breasts by putting mushroom mixture in the centre of the breast and tie with Butcher’s twine. Dredge Breasts in Flour. In same saucepan, brown Chicken Breasts in 1 Tbs. Butter. Place Chicken Breasts on rack in a roasting pan. Melt remaining 1 tablespoon. Butter and baste Chicken with melted Butter. Roast for 20 minutes at 425°F. For presentation, slice Chicken Roulade thinly and place onto the delicious prawn sauce.