Step 1

Place 2 sticks unsalted butter in a large bowl and let sit at room temperature until softened.

Step 2

Prepare the following, adding each to the bowl of butter as it is completed: Grate 8 ounces Monterey Jack cheese on the large holes of a box grater (about 2 cups). Mince 2 garlic cloves.

Step 3

Add 1/2 cup mayonnaise, 2 (4-ounce) cans diced green chiles (do not drain), and 1 teaspoon kosher salt, and mix until well-combined. Cover and refrigerate for at least 1 hour and up to 1 day.

Step 4

Arrange a rack 3 to 4 inches from the broiling element and heat the oven to broil. Meanwhile, line 2 rimmed baking sheets with aluminum foil. Cut 1 baguette crosswise into 1/2-inch-thick rounds. Arrange the slices on the baking sheets, spacing them at least 1/2-inch apart. Let the butter mixture sit at room temperature for a few minutes, then divide the mixture onto the bread slices (about a heaping tablespoon on each) and spread to the edges. Refrigerate until the oven is heated.

Step 5

Broil 1 sheet at a time, rotating the baking sheet halfway through, until the tops are browned in spots and the edges of the bread are crispy, 4 to 10 minutes per sheet.