Dice the cheese and cut the blackberries in half or in 4 pieces (depending on their size). Mix the flour and the baking powder in a bowl, together with the goat’s cheese and the blackberries. Mix the eggs, the yogurt, the thyme, the olive oil, the pepper and the salt in another bowl. Then mix the two preparations obtained. Butter the muffin baking tins and fill them with the mixture. Bake during 30 minutes in an oven at 355°F (180°C).