Lydia's Hash Brown Casserole

INGREDIENTS

• 1 (2 pound) package frozen hash brown potatoes
• 1 (10.75 ounce) can condensed cream of chicken soup (such as Campbell's®)
• 1 cup cubed ham
• 1 (8 ounce) container sour cream
• 1 (8 ounce) package shredded Cheddar-Monterey Jack cheese blend
• 1/2 cup frozen broccoli florets
• 1/4 onion, chopped - or more to taste
• 2 cloves garlic, minced
• ground black pepper to taste
• 1/2 cup crushed corn flakes cereal