Cut collard greens into 2 inch pieces (2lb collard greens)
Heat oil in a large pot over medium-high heat. Add bacon and cook until crisp, 5 to 7 minutes. Remove bacon from pan, crumble, and return to the pan (6 slices bacon)
Add onion to the pan and cook until tender, about 5 minutes. Add garlic and cook until just fragrant. Add collard greens and fry until they start to wilt (1 onion, 4 cloves garlic, 2lb collard greens)
Pour in chicken broth and season with salt, pepper and red pepper flakes. Reduce heat to low, cover and simmer until greens are tender, about 45 minutes (2 tsp salt, 2 tsp pepper, pinch red pepper flakes)