Heat the oven to 200 C / 400 F.
Set the feta block in the center of a 20 x 25 cm / 8 x 10-inch baking dish. Scatter the cherry tomatoes around it.
Drizzle the olive oil over the feta and tomatoes. Scatter the minced garlic, red pepper flakes, salt, and black pepper on top.
Bake for 22 to 25 minutes, until the tomatoes have burst and the feta is soft with lightly golden edges.
Remove from the oven and let it rest for 5 minutes.
Dollop the basil pesto over the hot feta so it softens and swirls slightly.
Mash the feta, tomatoes, and pesto together with a fork right in the dish, until you have a chunky, spreadable sauce.
Top with fresh basil and toasted pine nuts. Serve warm with cucumber slices or keto crackers for scooping.