01 -
Preheat oven to 190°C. Halve the poblano peppers lengthwise and remove the seeds and membranes. Place poblanos and chopped onion on a baking tray. Drizzle with olive oil and season lightly with salt and pepper. Arrange peppers skin-side up and roast for 30 minutes.
02 -
Transfer roasted peppers to a plastic bag or bowl covered with plastic wrap to steam. Once cooled slightly, peel away and discard the skins.
03 -
In a medium skillet over medium-high heat, melt the butter. Add flour and whisk continuously to form a paste. Cook the roux for 2-3 minutes until lightly golden, then gradually whisk in chicken broth. Continue cooking and whisking for 5-10 minutes until slightly thickened.
04 -
Transfer the roux mixture to a blender or food processor. Add peeled poblanos, roasted onion, sour cream, garlic, cumin and salt. Blend until completely smooth.
05 -
Taste and season with additional salt and pepper if required. Serve warm as desired.