Light Jalapeno Popper Dip

light mayonnaise2 8-ounce packages 1/3 reduced fat cream cheese, softened1 4-ounce can diced jalapeños, drained1/4 teaspoon pepper1/4 teaspoon granulated garlic3 green onions, thinly sliced (about 1/3 cup)1 cup 2% milk shredded cheddar cheese