Red Pepper Soup With Grilled Shrimp

• 6 garlic (cloves minced)
• 3 sweet peppers up (red cut)
• 1 onion (chopped)
• 1 potato (peeled)
• 1 lowfat milk
• 700 ml chicken broth
• 250 gr shrimp (fresh)
• 20 gr parmesan cheese (shredded)
• 20 ml olive oil
• 5 gr butter