In the bowl of a food processor or blender, purée red peppers and 2 cups broth until smooth. Transfer to a large saucepan and add remaining 2 cups broth, oregano, bay leaves and beans. Stir to combine, heat on medium-high and bring to a gentle boil. Decrease heat to medium-low and simmer, stirring occasionally, for 2 minutes.Meanwhile, coat a large grill pan or griddle with cooking spray and heat on medium-high. Season shrimp with black pepper. Add shrimp to 1 side of pan and cook for 1 to 2 minutes per side, until opaque and cooked through. Transfer to a large plate. Meanwhile, brush oil on cut sides of baguette, dividing evenly. Place baguette oil side down in remaining half of grill pan and toast until golden-brown, about 2 minutes. Immediately rub toasted side of baguette with cut side of garlic. Cut baguette into 4 2-oz slices.Remove soup from heat. Remove and discard bay leaves; stir in basil. Ladle soup into serving bowls, top with shrimp and serve with baguette, dividing evenly.