Baked Broccoli-and-Artichoke Shells

Preheat oven to 425°F. Cook pasta in a pot of salted boiling water 4 minutes. Add broccoli and cook 2 minutes more; drain. Combine panko and 2 tablespoons Parmigiano.

In a saucepan, cook bacon over medium heat until crisp, 4 to 5 minutes. Transfer to paper towels. Add butter to pan; melt. Whisk in flour; cook 1 minute. Slowly whisk in milk. Bring to a simmer; cook, whisking, until thickened slightly, about 4 minutes. Stir in remaining Parmigiano, cheddar, artichokes, broccoli, pasta, and bacon; season to taste.

Transfer mixture to a 2-quart baking dish. Sprinkle with panko mixture. Bake until golden and bubbling, about 20 minutes. Let cool slightly before serving.