Put the peppers in a microwave-proof saucepan, better with vents in the lid (Or cover with cling film and prick it with a fork.
Cook the bell peppers until they soften, something like 5-6 minutes, depending on the intensity of the appliance; after half the time, turn the peppers so they cook evenly. Remove and let cool.
Cut the bell peppers, open them and clean from core and seeds, and transfer them to a blender.
Add the rest of the ingredients to the blender: sliced garlic, olive oil, salt, white pepper, chili powder, and sweet paprika. Grind until you get a smooth cream; Taste and adjust seasoning if necessary.