Step 1

Preheat oven to 400 degrees F.

Step 2

Place squash, cut-side down, in a microwave-safe dish; add water. Microwave, uncovered, on High until tender, about 10 minutes. (Alternatively, place squash halves cut-side down on a rimmed baking sheet. Bake at 400 degrees F until tender, 40 to 50 minutes.)

Step 3

Meanwhile, cook ground beef in a large ovenproof skillet over medium-high heat, breaking it up with a wooden spoon, until no longer pink, 5 to 7 minutes. Add shallot, garlic, Italian seasoning, salt and pepper and cook, stirring, for 1 minute. Stir in tomatoes and bring to a boil. Reduce heat to maintain a simmer.

Step 4

Use a fork to scrape the squash flesh from the shells into the sauce; stir to combine. Top with cheese. Transfer the pan to the oven and bake until bubbling, about 15 minutes. Let stand for 5 minutes. Serve sprinkled with basil, if desired.