How to Make It
Combine tomatoes, olive oil, salt and thyme in slow cooker and toss to coat. Cover and cook on low until tomatoes are shriveled and very soft, 4 to 6 hours.
Cook bacon in a skillet over medium-high heat, turning occasionally, until crisp, about 8 minutes. Spread mayonnaise on bottom halves of baguette lengths. Top with lettuce, tomatoes and bacon. Place top halves of baguette on top and serve right away.