Step 1:
Preheat oven to 375°F (190°C). Lightly grease a 6-cup (1.5 L) shallow baking dish.
Step 2:
In a medium skillet, melt 1 tbsp (15 mL) of the butter over medium heat. Add onion and cook, stirring occasionally, until caramelized, about 8 minutes. Set aside.
Step 3:
In a medium saucepan, melt the remaining 2 tbsp (30 mL) of butter over medium heat. Sprinkle in flour, salt, and pepper; cook, stirring for 1 minute. Slowly stir in milk and cook, stirring constantly, until the mixture thickens. Remove from heat and stir in cheese and mustard. Set aside.
Step 4:
In the prepared baking dish, layer half of the potato slices. Top with half of the egg slices and half of the cheese sauce. Sprinkle with bacon and top with onions. Repeat with the remaining potato, egg, and sauce layers.
Step 5:
In a small bowl, toss crumbs with melted butter and sprinkle over the casserole. Bake for about 20 minutes or until bubbly and golden. Serve warm.
In partnership with Ontario Pork.
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