Preheat oven to 425°F.
Place the baguette slices on a baking sheet. Brush the tops with 1-2 tablespoons of olive oil. Bake for 5-7 minutes, or until just toasted.
Toss the grapes with the olive oil, thyme leaves and a pinch of salt. Place on a rimmed baking sheet in a single layer. If they are too crowded, they will steam rather than blister and caramelize. Cook at 425°F for 15-20 minutes or until blistered.
While the grapes are roasting, make the whipped cottage cheese. Add the cottage cheese, goat cheese, lemon zest, honey, and salt to a food processor and process until smooth. It may take a full 2-3 minutes to get completely smooth. Adjust honey and salt to taste.
Top crostini with whipped cottage cheese followed by roasted grapes. Drizzle with balsamic glaze and sprinkle flaky sea salt and thyme on top.