Cook the spaghetti according to package instructions, drain and set aside.
16 ounces spaghetti
While the spaghetti is cooking, trim and cut into pieces the peppers and the onion.
2 poblano peppers, ½ onion
Place the pepper and onion pieces in a food processor, along with the garlic and the bouillon cube. Pulse a few times to break down the vegetables.
1 tablespoon minced garlic, 1 bouillon cube
Add the sour cream, then process until the mixture is smooth.
1 cup sour cream
In a large saucepan, melt the butter, then add the pepper mixture and bring to a simmer.
1 tablespoon butter
Season with salt and pepper as desired.
salt & pepper (optional)
Cook for about 4-5 minutes, then add the spaghetti and toss to coat.
Notes
You can use your favorite pasta. Just cook to al dente according to the package instructions.
If you like your pasta dishes on the saucier side, consider making 1.5 times the sauce or even double it.
For even more flavor, roast the poblano peppers first. You can do this over an open flame on a gas stove or under the broiler. Once charred, let cool and remove the skin and seeds prior to placing them in the food processor.
Add a squeeze of lime to the sauce to broaden the flavor profile.
Garnish with cilantro, parsley, and/or grated cotija or queso fresco cheese.