Warm apple Brown Betty with layers of spiced apples and buttery breadcrumb topping is a nostalgic American family dessert. This simpler cousin of apple pie delivers cozy, homestyle comfort.
Preheat the oven to 350°F (175°C). Butter a 2-quart baking dish to prevent sticking.
Cut the day-old bread into small cubes, spread on a baking sheet, and toast for 8 minutes until just dry but not browned.
Peel and slice apples and toss them with lemon juice, 0.5 cup of brown sugar, 1 tsp cinnamon, nutmeg, and salt in a large bowl.
Melt the butter completely, then pour half over the bread cubes and toss; mix remaining brown sugar and cinnamon into the bread for even spice.
Layer half the spiced apples on the bottom of the prepared dish, cover with half the buttery crumbs, repeat with remaining apples, then top evenly with all remaining crumb mixture.
Drizzle the last melted butter over the top. Bake for 40–50 minutes, uncovered, until the top is golden and apples are tender but not mushy; cool 10 minutes before serving.