Preheat your oven to 400°F (200°C).

In a medium skillet over medium heat, brown the ground beef with the onion and optional minced garlic for 5–7 minutes until the beef is cooked through and the onions are translucent. Drain excess fat.

Season the beef mixture with salt and pepper to taste, stirring for another 1–2 minutes to meld flavors.

Grease a 9-inch pie dish and spread the cooked beef mixture evenly across the bottom.

Sprinkle shredded cheddar cheese generously over the beef layer.

In a mixing bowl, whisk together the eggs, milk, and Bisquick mix until smooth, then pour over the cheese and meat layers.

Bake in the preheated oven for 25–30 minutes until the top is golden brown and a toothpick comes out clean.

Let cool for 5–10 minutes before slicing and serving warm with optional toppings.