HEAT greased grill to medium-high heat.
MIX meat, spinach, bacon, garlic powder and crushed red pepper just until blended; shape into 8 meatballs.
PRESS 1 VELVEETA cube into center of each meatball, completely enclosing VELVEETA. Flatten to 2-1/2-inch diameter. Grill 5 min. on each side or until done (160°F).
FILL buns with burgers.
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