Step 1 If you need to crisp up the bacon, preheat the oven to 190 °C/ 375 °F (fan assisted), or 210 °C/ 410 °F (conventional). Line a baking tray with parchment paper. Lay the bacon slices on top of it and place in the oven. Cook for 10-15 minutes until crispy brown. When done, remove from the oven and set aside. Reduce the temperature to 175 °C/ 350 °F (fan assisted), or 195 °C/ 380 °F (conventional).