Stovetop Mac and Cheese

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1 pound penne pasta 

4 tablespoons unsalted butter 

2 teaspoons fresh thyme 

1 clove garlic, minced 

1 pound white button mushrooms, sliced 

Freshly ground black pepper

1/4 cup all-purpose flour 

2 cups whole milk 

1/2 cup heavy cream 

1 tablespoon Dijon mustard 

2 cups grated fontina cheese 

1/2 cup grated Parmesan 

6 slices Taleggio cheese