Step 1

Preheat oven to 250°. Butter a 13x9x2-inch baking dish and set aside. Scatter bread in a single layer on a rimmed baking sheet. Bake, stirring occasionally, until dried out, about 1 hour. Let cool; transfer to a very large bowl.

Step 2

Meanwhile, melt 3/4 cup butter in a large skillet over medium-high heat; add onions and celery. Stir often until just beginning to brown, about 10 minutes. Add to bowl with bread; stir in herbs, salt, and pepper. Drizzle in 1 1/4 cups broth and toss gently. Let cool.

Step 3

Preheat oven to 350°. Whisk 1 1/4 cups broth and eggs in a small bowl. Add to bread mixture; fold gently until thoroughly combined. Transfer to prepared dish, cover with foil, and bake until an instant-read thermometer inserted into the center of dressing registers 160°, about 40 minutes.

Step 4

Continue to bake dressing, uncovered, until set and top is browned and crisp, 40–45 minutes longer.

Step 5

Do Ahead: Dressing can be baked (before browning) 1 day ahead. Uncover and let cool, then cover and chill. Uncover and bake until top is browned and crisp, 50–60 minutes.