My grandfather taught me this 4 ingredient secret and it literally melts in your mouth

This oven baked 4-ingredient cacio e pepe pasta is my busy-weeknight version of the comforting dish my Italian-American grandfather used to make. His secret was letting the pasta finish cooking slowly in the oven with just enough starchy water, good pecorino, and freshly cracked black pepper so it turns unbelievably creamy and literally melts in your mouth—no cream, no butter, nothing fancy. It’s the kind of practical, low-stress recipe that feels special but fits right into a hectic workday, and it bakes up in one white casserole dish for easy serving and cleanup.

Serve this cacio e pepe straight from the hot casserole dish with a simple green salad (I love mixed greens with lemon and olive oil) and some roasted vegetables like broccoli or asparagus. A crisp white wine or sparkling water with lemon balances the richness. You can set the casserole dish in the center of the table and let everyone scoop their own portion—family-style—alongside warm crusty bread for swiping up every last bit of that glossy, pepper-flecked cheese sauce.

Servings: 4

12 oz dried spaghetti or bucatini

Preheat your oven to 375°F (190°C). Lightly grease a white glass casserole dish (about 9x13 inches) if you like, just to make cleanup easier, and set it aside.

Bring a large pot of water to a boil and stir in the kosher salt. Add the spaghetti and cook for about 2 minutes less than the package directions for al dente (the pasta should still be quite firm in the center). While the pasta cooks, finely grate the Pecorino Romano and crack the black pepper.

Before draining the pasta, carefully scoop out 2 1/2 cups of the starchy pasta cooking water and set it aside. Drain the pasta well but do not rinse it.

Add the hot, drained pasta back into the warm pot (off the heat). Sprinkle in 2 teaspoons of the freshly cracked black pepper and toss quickly so the heat blooms the pepper and coats the strands.

Pour 1 3/4 cups of the reserved hot pasta water over the pasta in the pot. Add the finely grated Pecorino Romano cheese in 3 to 4 small handfuls, tossing or stirring well after each addition so it melts gradually into a glossy sauce instead of clumping. If the mixture looks too thick or dry, add more of the reserved pasta water a splash at a time until it’s very saucy and loose; it will thicken in the oven.

Transfer the saucy pasta and every bit of the cheese mixture into the white glass casserole dish, gently twisting the noodles so they settle into an even layer. The sauce should look glossy and a little runny at this point.

Sprinkle the remaining 1/2 teaspoon of cracked black pepper evenly over the top for those classic visible flecks. Give the dish a gentle shake to help the sauce settle around the pasta.

Bake, uncovered, for 10–15 minutes, just until the pasta has absorbed some of the sauce and everything looks creamy and lightly bubbling around the edges. The top should look glossy, not dry. If it seems dry at any point, drizzle on a few tablespoons of hot water and gently toss.

Remove the casserole dish from the oven and let the pasta rest for 3–5 minutes. This short rest is the “grandfather secret” moment where the sauce thickens slightly and the pasta becomes incredibly tender and melty without overcooking.

Toss the pasta gently right in the casserole dish to re-coat everything in the sauce, then serve immediately, spooning the glossy, peppery cheese sauce from the bottom over each portion. Top with a little extra Pecorino Romano and more cracked black pepper if you like.

For a slightly lighter feel, you can swap half of the Pecorino Romano for finely grated Parmesan, though the flavor will be a bit milder and less sharp. If you prefer more heat, add an extra 1/2 teaspoon of freshly cracked black pepper, but always crack it fresh—pre-ground pepper won’t give the same aroma or little flecks. To get ahead on a busy night, you can cook the pasta and toss it with the cheese and pepper up to an hour in advance; keep it in the casserole dish at room temperature, then stir in a splash of hot water right before baking to loosen it back up. For a slightly crisp top while keeping the inside creamy, broil the dish for 1–2 minutes at the very end, watching closely so the cheese doesn’t burn. If you need to reheat leftovers, add a spoonful of water, cover the dish with foil, and warm it in a low oven (300°F / 150°C) until just hot and melty again, then toss to bring back that glossy sauce.