Heat oven to 350°F. Grease a 9x13-inch baking dish with a little melted butter.
Cook bacon in a skillet until crisp. Drain on paper towels and crumble.
Cut biscuit dough into 1-inch pieces and scatter evenly in the dish.
Whisk eggs, milk, salt, pepper, garlic powder, and half the green onions until smooth.
Sprinkle biscuits with crumbled bacon and half the cheddar.
Pour the egg mixture over the dish. Gently press to help biscuits soak.
Top with remaining cheddar. Brush the top lightly with any extra melted butter, if desired.
Bake 30–35 minutes, until the center is set and the top is golden. Tent with foil if browning fast.
Rest 10 minutes. Garnish with remaining green onions, slice, and serve warm.