01 -
Preheat your oven to 175°C (350°F) to ensure even baking.
02 -
Lightly grease a 33 x 23 cm (9x13-inch) baking pan with butter or nonstick spray.
03 -
Arrange an even layer of thinly sliced russet potatoes at the bottom of the prepared baking dish.
04 -
Drizzle the potato layer with a small amount of olive oil.
05 -
Scatter browned and crumbled lean ground beef evenly over the potatoes.
06 -
Place a layer of sliced onion rings evenly atop the beef.
07 -
Layer sliced tomatoes or evenly distribute the canned diced tomatoes over the onions.
08 -
Top with chopped green bell peppers to complete the layers.
09 -
Lightly season each layer with kosher salt and freshly ground black pepper.
10 -
Cover the baking dish securely with aluminum foil and transfer to the preheated oven.
11 -
Bake for 2 hours until vegetables are tender and flavors meld together.
12 -
Remove from the oven and allow to cool slightly before serving.