Everything Bagel Carbonara

Name: Everything Bagel Carbonara
Ingredients: Kosher salt; 12 ounces spaghetti; 1/4 cup extra-virgin olive oil; 6 ounces pastrami, cut into 1/4-by-1-inch sticks (see Cook's Note); 2 tablespoons capers; 2 large eggs, lightly beaten, at room temperature; 1/4 cup (2 ounces) cream cheese, cut into small pieces, at room temperature; 1/2 cup grated Parmesan, plus more for finishing; 3 scallions, white and light green parts, thinly sliced; 2 tablespoons everything bagel seasoning, plus more for finishing