Step 1
In a large skillet over medium heat, melt butter. Add mushrooms and cook until soft, 5 minutes. Add garlic and cook until fragrant, 1 minute more. Add flour and stir to coat mushrooms, then add milk and broth slowly and whisk until no lumps remain. Simmer until sauce is thickened, 5 minutes. Season with salt, pepper, and a pinch of cayenne.
Step 2
Add pimentos, peas, and chicken and cook until warmed through, 5 minutes.
Step 3
Serve over cooked pasta.
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