Flatten each slice of trimmed bread with rolling pin. Spread slices with mustard.(my picture shows I put mustard on first and then trimmed)
Top each piece of bread with 1 slice of ham, 1 slice of turkey and 1 slice of swiss cheese. Roll up bread tightly, using plastic wrap to assist the rolling. Wrap tightly in plastic wrap to assure even log shape. (Roll from the longest side). Chill for 30 minutes.)
Beat together baking mix and eggs in medium bowl to make the batter. Add milk, salt and cinnamon.
Heat 1 1/2 inches oil in deep-fryer or deep saucepan to 375..(be careful, don't get hotter than that, they will burn easily). Unwrap each roll from the plastic wrap and secure with 4 wooden toothpicks. With a knife, slice each roll into 4 pieces, securing with toothpicks. You may end up getting more than 4 per slice of bread..depends on bread size.
Dip each piece in batter, allowing some batter to be absorbed. Fry a few pieces at a time in hot oil for 1-2 minutes or until deep golden brown, turning frequently. This goes fast..and you have to keep turning, otherwise they brown in one spot too quickly. It take NO more than a minute or so..
Also notice the little pieces of batter that came off once you place them in this hot oil...be sure to remove with slotted spoon or small strainer before adding more Cristo's..otherwise the small pieces end up burnt and will stick to your new Cristo's once you add them, these little pieces add up fast in the pot, so remove ASAP.
Drain WELL on paper towels. Serve IMMEDIATELY or keep warm in oven at 175 degrees...serve with spicy mustard.
TIP...to make a day ahead, prepare and fry as directed. Cool. Cover and refrigerate. Reheat in a single layer on a baking sheet in 425 degree oven for 8-10 minutes.