Mashed Potatoes with seasoning

2 lbs thin-skinned potatoes , like Yukon Golds, scrubbed but not peeled, sliced 1/4-inch thick 3 large garlic cloves 1 1/2 cups corn kernels (fresh or frozen)[...]

8 medium red potatoes 6 -7 medium carrots 1/4 lb butter , do NOT use margarine 2/3 cup buttermilk Lawry's Seasoned Salt, to taste black pepper , to taste 1[...]