Cook the pork over medium-high heat, stirring often, until no longer pink. Then add onions and seasonings. Lower heat and cook mixture about 10 minutes more; it should be well cooked to a light brown. Add this to mashed potatoes; mix well. Add garlic and more seasoning if desired. Bake in double-crust pies, about 400 degrees F, until crust is well cooked (golden brown), about 40 minutes.