Mac and Cheese Primavera

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1 pound medium pasta shells

2 tablespoons salted butter 

2 tablespoons olive oil 

1 cup small broccoli florets 

2 scallions, sliced, whites and green parts separated 

2 cloves garlic, minced 

1 bunch asparagus, cut into 2-inch pieces 

1 small red bell pepper, diced 

1 teaspoon kosher salt 

1/2 teaspoon freshly ground black pepper 

1/2 cup dry white wine 

2 cups whole milk 

1/2 cup heavy cream 

1 cup frozen peas 

1 cup shredded fontina cheese 

1 cup shredded white Cheddar 

2 teaspoons cornstarch