01 -
Preheat oven to 175°C.
02 -
Place chopped roast beef in a large skillet over medium-high heat and cook for 2 minutes, stirring occasionally. Add diced onion, green bell pepper, and red bell pepper. Continue cooking, stirring often, until vegetables soften.
03 -
Add chopped garlic and steak spice to the skillet. Stir well and cook for 3 minutes. Lower the heat and add cheddar soup and 120 ml milk. Stir until combined. Add shredded cheddar cheese and mix thoroughly. Remove skillet from heat.
04 -
Generously coat a 23 x 33 cm baking dish with spray oil. Spread the roast beef mixture evenly into the prepared dish.
05 -
Empty biscuit mix into a mixing bowl, reserving the seasoning packet. Add 120 g shredded cheddar and 480 ml milk. Stir until smooth and no large lumps remain.
06 -
Pour biscuit batter over the roast beef filling, spreading it evenly. Bake in preheated oven for 50–55 minutes, until the biscuit topping is golden brown across the surface.
07 -
Remove baking dish from oven. Mix 60 ml melted butter with the reserved seasoning packet in a small bowl. Brush this mixture over the biscuit topping. Let the casserole rest 5 minutes before serving.