Wash and chop the zucchini and yellow squash into large half moons if you want softer or dials if you want them to stay a bit more firm. It will cook faster than the other vegetables, so leave the pieces fairly large. Add them to a 6 quart slow cooker. Add in the baby carrots.
Wash and dice the bell peppers (discarding the seeds and stem) into 1” size pieces. Add them to the crockpot. Add in the pearl onions.
In a small jar or bowl, combine the olive oil and all the spices (except the thyme) and pour over all the vegetables in the pot. Give them a good stir to coat all the vegetables. Add in the broth and fresh thyme and stir.
Cook on low heat for 2.5-3 hours, or until the vegetables are tender enough for your liking. Stirring occasionally helps them all become the same texture. Serve warm.