Spray a large nonstick pot or skillet with nonfat cooking spray and set over medium-high heat.

Add bacon, and cook until crisp. Remove bacon from pan and set aside to cool.

Re-spray the pan with a bit of the nonfat cooking spray and then add in the onion, and cook until tender, about 5 minutes.

Add garlic, and cook until just fragrant.

Add collard greens, and fry until they start to wilt.

Pour in chicken broth, and season with salt, pepper, and red pepper flakes.

Chop or crumble the cooled bacon and add it into the pot.

Reduce heat to low, cover, and simmer for 45 minutes, or until greens are tender.