Start by preheating your oven to 450°F (230°C). Pour the melted butter into your baking dish and spread it evenly across the bottom. This butter layer is key to achieving those crispy, golden edges.
In a large mixing bowl, combine flour, baking powder, sugar, and salt. Stir everything together well to ensure the leavening is evenly distributed. This step helps the biscuits rise uniformly.
Pour in the buttermilk and gently mix until just combined. Fold in the diced ham and shredded cheese, making sure they’re evenly spread throughout the dough. Avoid overmixing to keep the biscuits tender.
Carefully place the dough into the buttered baking dish. Spread it out evenly so it reaches all corners. The dough will sit directly in the melted butter, which is exactly what you want.
Use a knife to cut the dough into squares before baking. This makes it easier to separate the biscuits later and helps them bake evenly. Don’t skip this step—it really helps with portioning.
Place the dish in the oven and bake for about 25–30 minutes. The top should turn golden brown while the edges become crisp from the butter. Let it cool slightly before serving.