Preheat your oven to 400°F (200°C). This ensures even baking and a nicely browned top.

Spray a 10-inch pie plate with non-stick cooking spray. This helps prevent sticking and makes cleanup easier.

In the bottom of the pie plate, evenly layer the chopped ham, green chile, cheese, and onions. This ensures every slice has a little of everything.

In a large mixing bowl, whisk together the eggs, milk, salt, and pepper. Add the Bisquick and whisk until smooth and lump-free. The mixture should be pourable and creamy.

Carefully pour the egg mixture over the layered ingredients in the pie plate. If you like, sprinkle a bit of dried parsley or paprika on top for color.

Bake in the preheated oven for 35–45 minutes. Check for doneness by inserting a toothpick or knife into the center—it should come out clean. The top will be lightly golden and puffed.

Let the quiche cool for 5–10 minutes before slicing. This allows the filling to set and makes it easier to serve.