Shepherd's Pie

Dice the medium onion into small, uniform pieces.

Heat a large skillet over medium-high heat and add the ground beef, breaking it apart with a spoon as it cooks until browned throughout.

Add the diced onion to the beef and stir until softened, about 3 minutes.

Season the beef mixture with salt and a dash of pepper, stirring well to combine.

Stir in the drained canned green peas and the condensed tomato soup until evenly mixed throughout the beef.

Preheat the oven to 350°F (175°C).

Transfer the beef mixture to a shallow baking dish, spreading it in an even layer.

Spread the mashed potatoes evenly over the beef layer, smoothing the top with the back of a spoon or spatula.

Bake in the preheated oven until the top is lightly golden and the filling is hot throughout, about 20–25 minutes.

Remove from the oven and let rest for 2–3 minutes before serving.