Sautéed Garlic Beef Stir Fry with Bell Peppers

By AislePrompt Editorial · Published 2026-05-18 · Updated 2026-05-18

Quick and flavorful beef stir fry with crisp bell peppers and a savory garlic-soy sauce, perfect for a high-protein weeknight dinner. This Asian-inspired beef recipe (high protein), ready in about 20 minutes, pairs flank steak, red bell pepper, yellow bell pepper for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 350 calories and feeds 3, 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.

Ingredients

• 12 oz, thinly sliced against the grain flank steak
• 1 medium, julienned red bell pepper
• 1 medium, julienned yellow bell pepper
• 5, minced garlic cloves
• 3 tbsp soy sauce
• 1 tbsp sesame oil
• 2 tbsp vegetable oil
• 1 tsp brown sugar
• 1 tsp cornstarch
• 3 tbsp water
• 2, sliced thinly for garnish green onions
• 1/4 tsp, optional red pepper flakes

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Instructions

1. Step 1: In a small bowl, whisk together 3 tbsp soy sauce, 1 tsp brown sugar, 1 tsp cornstarch, and 3 tbsp water until smooth to make the stir fry sauce.
2. Step 2: Heat 2 tbsp vegetable oil in a large skillet or wok over high heat until shimmering. Add 12 oz thinly sliced flank steak and cook for 2-3 minutes, stirring frequently until browned but not fully cooked through, then remove from skillet.
3. Step 3: In the same skillet, add 1 tbsp sesame oil and 5 minced garlic cloves, sauté over medium-high heat for 30 seconds until fragrant.
4. Step 4: Add 1 julienned red bell pepper and 1 julienned yellow bell pepper to the skillet, stir fry for 3-4 minutes until peppers are tender-crisp.
5. Step 5: Return the beef to the skillet and pour in the prepared sauce along with 1/4 tsp red pepper flakes if using, stirring constantly for 2 minutes until the sauce thickens and coats the beef and peppers evenly.
6. Step 6: Remove from heat and garnish with 2 sliced green onions before serving immediately.