In a large bowl, combine 1-1/2 cups flour, sugar, potato flakes, yeast, salt, dill and garlic powder. In a small saucepan, bring water and butter just to a boil.
In a small bowl, pour boiling liquid over oats. Let stand until mixture cools to 120°-130°, stirring occasionally. Add to dry ingredients; beat just until moistened. Add egg; beat until smooth. Stir in enough remaining flour to form a firm dough (dough will be sticky).
Turn onto a floured surface; knead until smooth and elastic, 6-8 minutes. Knead in mozzarella cheese. Place in a large bowl coated with cooking spray, turning once to coat the top. Cover and let rise in a warm place until doubled, about 1-1/4 hours.
Punch dough down. Turn onto a lightly floured surface; divide into 24 pieces. Shape each into a ball. Place in a 13x9-in. baking pan coated with cooking spray; brush milk over rolls.
In a small bowl, combine the remaining ingredients, sprinkle over tops. Cover and let rise until nearly doubled, about 45 minutes.
Preheat oven to 375°. Bake 20-25 minutes or until golden brown. Remove from pan to a wire rack. Refrigerate leftovers.