In a large saute pan over medium-high heat, add the oil. Stir in the garlic and red pepper flakes and cook until the garlic begins to brown, about 1 minute. Add the broccoli and toss until tender and it begins to color, about 3 to 4 minutes. Season the broccoli with salt and pepper, to taste. Stir in the chicken stock and cover to steam for a few minutes. Transfer to a serving bowl and serve.