Lightly grease or spray a 13 x 9-inch (33 x 23 cm) baking dish. Layer ham, cheese, green onion and asparagus in dish.
Whisk milk into baking mix a little at a time so mixture doesn’t get lumpy. Whisk in eggs just until blended. Pour mixture carefully over ingredients in baking dish.
Bake in a preheated 400°F (200°C) oven until puffed and golden brown, and a knife inserted in centre comes out clean, 35 to 45 minutes.
Let cool for 5 minutes before slicing and serving.
This was so easy to make and very yummy!!