1. Preheat grill to 300° to 350° (medium) heat. Drizzle 1 side of bread slices with 3 Tbsp. olive oil. Grill bread slices 1 to 2 minutes or until toasted. Cut bread slices into triangles. Place on a serving platter.
2. Devein shrimp, if desired. Season shrimp with salt and pepper. Melt butter with remaining 2 Tbsp. olive oil in a large skillet over medium-high heat; add shrimp, thyme, and next 2 ingredients, and sauté 2 to 3 minutes or just until shrimp turn pink. Add lemon juice and parsley. Serve immediately over grilled bread. Garnish, if desired.