Cheddar Jack Grilled Cheese with Grill Onions & Guacamole


singles and buttered white bread

What you will need

1 stick (4 ounces) unsalted butter at room temperature, divided

2 small to medium yellow onions, thinly sliced

1/4 teaspoon kosher salt

4 ounces sharp cheddar cheese, grated

4 ounces Monterey Jack cheese, grated

1 teaspoon cornstarch

8 slices sourdough bread

8 ounces (about 1/2 cup) creamy guacamole

1 large ripe tomato, thinly sliced


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