In a large bowl, combine vegetables, olive oil, herbes de Provence, salt, and black pepper, tossing until well coated. Spread in a single layer on prepared baking sheet.
Bake until vegetables are tender, 30 to 35 minutes. Let cool slightly. Chop finely.
In a medium bowl, combine cream cheese and roasted vegetables, stirring well.
Spread cream cheese mixture onto a bread slice. Top with another bread slice, and spread with cream cheese mixture. Top with a third bread slice to make a triple-stack sandwich. Repeat with remaining bread slices and cream cheese mixture.
Using a serrated bread knife in a gentle sawing motion, trim and discard crusts from sandwiches. Cut each sandwich into 6 finger sandwiches.
Serve immediately, or cover with damp paper towels, place in a covered container, and refrigerate for a few hours until serving time.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/roasted-vegetable-tea-sandwiches/