Spicy Beef Stir Fry with Peppers

By AislePrompt Editorial · Published 2026-06-30 · Updated 2026-06-30

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are developed and reviewed.

A quick and colorful beef stir fry full of bold chili and garlic flavors. This Asian-inspired beef recipe, ready in about 30 minutes, pairs flank steak, soy sauce, cornstarch for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 15 min Serves 4 Asian cuisine 320 cal/serving

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Ingredients

1 lb, thinly sliced against the grain flank steak
3 tbsp soy sauce
1 tbsp cornstarch
2 tbsp vegetable oil
1 large, sliced into thin strips red bell pepper
1 large, sliced into thin strips yellow bell pepper
4, minced garlic cloves
1 tbsp, minced fresh ginger
1/2 tsp red chili flakes
1 tsp brown sugar
2, sliced for garnish green onions
1 tsp sesame oil

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Instructions

Step 1: In a medium bowl, combine 1 lb thinly sliced flank steak with 3 tbsp soy sauce and 1 tbsp cornstarch. Toss to coat and let marinate for 10 minutes.
Step 2: Heat 2 tbsp vegetable oil in a large skillet or wok over high heat until shimmering. Add the marinated beef in a single layer and sear for 2-3 minutes, stirring occasionally until browned but not fully cooked. Remove beef and set aside.
Step 3: In the same pan, add 1 large sliced red bell pepper and 1 large sliced yellow bell pepper. Stir fry for 3 minutes until tender-crisp.
Step 4: Add 4 minced garlic cloves, 1 tbsp minced fresh ginger, 1/2 tsp red chili flakes, and 1 tsp brown sugar to the peppers. Stir fry for 1 minute until fragrant.
Step 5: Return the beef to the pan, drizzle 1 tsp sesame oil, and toss everything together. Cook for another 2 minutes until beef is cooked through and sauce thickens slightly.
Step 6: Garnish with 2 sliced green onions and serve immediately over steamed rice for a fast, fiery meal.