1. Rinse porcini thoroughly. Combine porcini and 2/3 cup boiling water in a bowl; cover and let stand 30 minutes. Drain in a sieve over a bowl, reserving 1/4 cup soaking liquid. Chop porcini.
2. Cook pasta with 1 tablespoon salt in boiling water 10 minutes or until al dente; drain in a colander over a bowl, reserving 1/4 cup cooking liquid.
3. Heat oil in a large skillet over medium-high heat. Add shallots, mushroom blend, and garlic; sauté 5 minutes, stirring frequently. Stir in porcini, sherry, and remaining 1/4 teaspoon salt; cook 1 minute or until the liquid evaporates.
4. Finely grate 1 ounce cheese; crumble remaining cheese. Reduce heat to medium. Stir pasta, 1/4 cup reserved cooking liquid, 1/4 cup reserved porcini soaking liquid, 1/4 cup grated cheese, cream, chopped sage, and pepper into mushroom mixture; toss well to combine. Drizzle with truffle oil; toss. Place about 1 1/4 cups pasta mixture on each of 4 plates; top each serving with about 1 tablespoon crumbled cheese. Garnish with sage leaves, if desired.
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