In a Dutch oven, melt butter.
Add celery, onion, leeks and garlic.
Sauté until tender, about 5 minutes or when vegetables are about fork tender.
Add frozen mixed vegetables and stir to combine.
Sprinkle flour over top of veggies and stir to combine.
Cook another 2 minutes.
Add ham stock or chicken broth about 1/8 cup at a time until thoroughly incorporated.
Add parsley, marjoram, thyme, salt and pepper and stir into mixture.
Cook until thickened—about 10 minutes.
Add half-and-half or heavy whipping cream and cook an additional 2 minutes until incorporated and thickened.
Stir in ham.
Grease a 9 x13” glass baking dish.
Pour ham mixture into prepared dish.
Top with large cookie scoops of Cheddar Bay Biscuit dough.
Bake at 400° for 18-23 minutes or until biscuits are cooked through and biscuits are golden brown.
Brush Butter Glaze over top of biscuits as soon as they come out of the oven.