For the Cheese Sauce: In a medium-sized pot on medium heat add in the butter and melt. Next, whisk in the flour and combine. Pour in the milk while continuing to whisk and turn the heat to high until it the sauce becomes thick.
Finish the sauce by whisking in the shredded cheddar cheese. Keep warm.
To Plate: Place the tater tots in a bowl and pour on the cheese sauce. Next layer on the chopped chicken, drizzle of sour cream, olives, tomatoes, jalapeños, green onions, and optional crispy bacon.