Cook contents of rice and seasonings packet according to directions.
While rice is cooking, melt butter in large saucepan. Add onion and cook over low heat until tender.
Stir in flour, salt, and pepper. Gradually stir in half and half and chicken broth. Cook, stirring constantly, until thickened.
Stir in chicken, pimento, parsley, almonds and cooked rice.
Pour into greased 2-quart casserole dish. Bake, uncovered, in 400o oven for 30 minutes.